ZONE 2 TRAINING: How to Build Your Aerobic Base for Running + Beyond

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Zone 2 training might not seem like the most exciting way to develop your aerobic endurance.

Plodding your way through a zone 2 cardio workout without breathing heavy doesn’t sound as hardcore as blasting a high intensity Tabata session and finishing in a pool of your own blood, sweat and tears…

But as the old parable goes:

“The wise man built his house upon the rock”. 

One of my underlying goals here at Hero Movement is to explore and share training methods and habits that are sustainable.   

Alongside mobility training and other restorative practices, that’s where long duration, low intensity aerobic work – aka zone 2 training – comes into play.

This doesn’t mean I’m anti high-intensity training – it definitely has its place.

But in this article, I want to highlight the equally important role of slowing down with zone 2 cardio. 

Not just in promoting health and longevity, but in establishing a strong underlying aerobic base for athletic performance.

Whether you’re an aspiring triathlete or a weekend warrior, hopefully you’ll find something useful below that you can apply to your own movement practice.

Table of Contents + TLDR Summary:

  • Training Zones: The intensity of training can be split into ‘training zones’, which reflect our level of exertion based on a percentage of our max heart rate. These zones range from zone 0 (at rest or sedentary) up to zones 5-6 (nearing maximum intensity or all out effort).
  • Zone 2 Training: AKA Aerobic Base or MAF Training (after Dr. Phil Maffetone) are forms of sub-maximal endurance training that help build aerobic fitness while minimising stress on the body. While HIIT has its benefits, there are certain benefits that may be specific to Z2 training (for athletes & everyday people).
  • Calculate Your Z2: A quick way to approximate your upper heart rate limit of zone 2 is to use the Maffetone Method – subtracting your age from 180 (more accurate description discussed below).
  • The Infamous Grey Zone: Many people spend a lot of time sedentary (zone 0) and most of their training time at mid to high intensity (anaerobic zones 3-5), without much in-between (aerobic zones 1-2).
  • The 80:20 Principle & Training ScheduleWe can build our aerobic base and become more efficient athletes by spending more time in zones 1-2 (80%) through specific training, and/or by increasing our daily movement quota, topped up with small amounts of higher intensity training (20%).
  • Zone 2 Fat Loss & Nutrition: Zone 2 training may help you more efficiently burn dietary fat & body fat as a fuel. Some people thrive on a lower carb diet in conjunction with Z2 training, but it isn’t required.
  • Zone 2 FAQs: Common questions around zone 2 & MAF Method endurance training.

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Back to Basics: The Theory of Heart Rate Training Zones

Before we get stuck into the nitty gritty of zone 2 training, let’s go over some basic definitions:

To get our bodies moving, we need to transform the energy found in our food and stored in our body into a usable form, and we do this using three energy systems:

  1. The Phosphocreatine (PC) or Alactic System
  2. The Lactate System
  3. The Aerobic System

These energy systems contribute varying amounts towards re-synthesising the compound Adenosine Triphosphate (ATP), which we can think of as the ‘energy currency of our body’.  

ATP is essentially the only source of energy our body can use for work.

The main energy system we utilise depends on the intensity, type, and duration of exercise being performed, as well as the fuel sources available and the fitness levels of the individual.

Refer to my expertly drawn graph below for a visual representation:

zone 2 training

Aerobic vs Anaerobic Training Zones

Anaerobic systems:

  • The PC and lactate systems are both anaerobic – meaning they function without the use of oxygen.
  • If we use early man as an example, they would work anaerobically during high stress situations – like sprinting away from predators.
  • The PC system is used over short time periods, typically around 8-10 seconds of maximal work (think a max 60m sprint). After this, its capacity is exceeded and the lactate system takes over.
  • The lactate system is used during high intensity activities that last longer than 8-10 seconds. It’s great at providing a quick supply of energy, utilising glycogen (carbs) as the main fuel source.
  • As the name suggests, a by-product during ATP re-synthesis is lactic acid, which builds up in the muscles and is thought to contribute to muscle pain & fatigue – that all too familiar ‘burn’.

Aerobic System:

  • The aerobic system utilises oxygen, and is used mainly during longer distance, lower intensity work (but also contributes somewhat to activities that are short and intense).
  • Ancestral humans would be using the aerobic system all throughout the day as they travel long distances at a slow pace and carry out everyday tasks. 
  • Like the lactic acid system, it can use glycogen as a fuel, but the preference is usually to use dietary and body fat.
  • Unlike the lactic acid system, there are typically no negative byproducts when we’re working in the aerobic zone, so our ability to keep going is more dependent on fuel availability, structural integrity and mental fortitude. It’s typically your ‘go all day’ kind of pace.

Heart Rate Zones + Training Thresholds

As you can see from another expertly designed diagram below, exercise intensity can be split into distinct training zones based on a percentage of our maximum heart rate:


Zone 2 Training pyramid

Heart Rates Zones:

  • Not pictured, refers to complete rest and relaxation.
  • You’ll typically be at your resting heart rate or just above.
  • Also not pictured, refers to recovery work and everyday living. 
  • Think a basic mobility or stretching routine, gentle walk or recovery run
  • Typically 50-60% of your maximum heart rate and aerobic in nature. 
  • Still aerobic, and usually the lowest intensity zone used in training. 
  • A steady jog at a pace that you can still hold a conversation. 
  • Can be between 60-70% of your max heart rate, but we’ll discuss how to calculate your zone 2 more accurately later using the MAF Method.
  • Sneaking into anaerobic territory where we start to get lactic acid buildup.
  • A pacy 10k run where you can’t hold a conversation. 
  • Around 70-80% of your max heart rate.
  • Very anaerobic and difficult to endure for prlonged time periods.
  • Think a fast 3 to 5km run or even 400-800m repeats. 
  • Around 80-90% of your max heart rate.
  • Maximal effort work that’s extremely difficult to maintain for a prolonged time period. 
  • All out sprint pace.
  • 90-100% of your max heart rate.

Energy System Terms Explained:

  • Represents the point at which one system is taken over by another as the predominant system to provide the re-synthesis of ATP. 
  • E.g, as we transition from zone 2 to zone 3.
  • Occurs when the intensity of your exercise starts to take you out of the aerobic zone and into the anaerobic zone, and lactic acid concentrations start to rise. 
  • Although it may vary depending on the individual, this generally starts to occur at around 65-70% of your maximum heart rate, but we’ll look at this a little more closely later.
  • Zone 2 training is predominantly under that aerobic threshold, working in the aerobic zone.
  • When the build up rate of lactic acid in your bloodstream is much faster than the removal rate, and you reach the onset of blood lactate accumulation.
  • That’s when things start to get pretty painful, and you’re forced to lower the intensity.
  • Being anaerobic in nature, the higher zone work (3, 4, 5) will usually have you touching that threshold on a pretty regular basis, which is partly why it’s so attractive to a lot of people – it feels like you’re working hard.

The Issue with Modern Day Endurance Training

One of the BIG problems with the way many training programs are set out:

We’re big on the strength training, HIIT work, and weekend 5ks, but we forget about all the low-intensity work in-between.

So that equates to a lot of zone 0 (sitting at work, in the car, and in front of the TV) and small amounts of zones 3-6 work (lifting weights, running, HIIT training), but not a lot in zones 1 and 2.

This is sometimes referred to as the Grey Zone of no improvement (more on this later).

There are many people much smarter than me who feel that zone 2 work underpins and improves the efficiency of higher intensity work. 

By skipping it, it seems you’re cheating yourself out of a myriad of potential benefits…

When you start to incorporate it, not only do you become a more efficient endurance athlete, but it can also mean you’re able to perform at a faster pace without placing as much stress on your body.

What is Zone 2 Training?

As well as upping our low-level physical activity throughout the day, we can also train to make specific adaptations in zone 2.

The goal with zone 2 training is to exercise at a pace that allows you to sustain your heart rate just below the aerobic threshold for a prolonged time period (typically 30 minutes+).

  • This would be at heart rate of around 60-70% of your maximum (this is a rough range – we’ll look at how to more accurately calculate your personal Z2 below).
  • This could be walking, running, swimming or zone 2 cycling – even sports specific drills like shadow boxing or dribbling a football.
  • Whatever you like, as long as your heart rate stays around that aerobic threshold and you don’t cross into the land of lactic acid.
  • At this effort, it’s thought your body will best be able to make the physiological adaptations to improve your aerobic endurance.

Video: Zone 2 Training Basics

Dr Phil Maffetone: The Origins of Zone 2 Training

Dr. Phil Maffetone is widely regarded as the one of the leaders in the Z2 running movement – I highly recommend checking out his website here.

He was a big proponent of low intensity training, whole food nutrition, and proper recovery protocols way back in the 80’s, and coached triathlete Mark Allen to 6 Ironman World Championship victories. 

Unfortunately, despite having success with some of the top athletes in the world, many of Maffetone’s genius training methods didn’t take off in the mainstream. 

In a world where ‘lifehacks’ are king and the ‘go hard or go home’ mentality is celebrated, it’s easy to see how zone 2 isn’t as easy to sell as HIIT. The slow and steady approach is never as appealing as the apparent quick fix…

Nonetheless, the science is there, the results speak for themselves, and his training methods have stood the test of time.

The MAF Method Calculator: How to Determine Your Zone 2

If you want to engage in some focused zone 2 heart rate training, you ideally need to figure out your starting point.

The number we need is the upper limit of your zone 2 – your aerobic threshold, or sometimes referred to as your MAF (Maximum Aerobic Function) heart rate. 

If you have the time and money and want a real accurate measurement, you can go to a fancy lab and take a blood lactate test. 

They’ll hook you up to a heart rate monitor take samples of your blood as you exercise with increasing intensity until failure.

Expensive and not fun…

The easier method is do some basic calculations to get an approximate value. There are various ways one can calculate their zone 2. I personally like using the ‘Maffetone Method’, developed by the legend himself, also referred to as the 180-age formula.

Maffetone observed in his athletes that this was the point at which their form began to break down, as they made the transition from being predominantly aerobic, to using the anaerobic energy systems.

You an use the calculator below, or check out another article on how to calculate zone 2 (even if you don;t have a heart rate monitor). 

How to Structure a Zone 2 Training Session

The length of a zone 2 training session will vary depending on your current fitness levels and your goals, but below I’ve listed a framework that’ll help you get started.

We’ll use the example of a 30 year old athlete that’s had fairly consistent training and no health issues. 

Using the Maffetone Method, their upper limit for zone 2 would be around 180 – 30 = 150 bpm. 

  • Warm Up. Start your session with a warm up of about 10-15 minutes, working at around 10-20 bpm lower than your aerobic threshold value with increasing intensity (130-140 bpm for the above example).
  • Main Body. Your exercise time (anywhere from 20 minutes to several hours) should be spent hovering 0-10 bpm under that aerobic threshold (140-150 bpm for the above). If you don’t have a heart rate monitor, this is a pace at which you can maintain a comfortable conversation. 
  • Cool Down. Shoot for a similar heart rate and time frame as your warm up, but with decreasing intensity.
It sounds simple, but that’s really all there is to it.

Finding The Pace for Your Zone 2 Training

When starting out on a zone 2 training plan, the main thing most people find difficult is this:
It feels too damn slow. 

As someone who used to embrace the ‘go hard or go home’ mentality, it was difficult for me at first to comprehend finishing a session without even breaking a sweat.

In the early stages (particularly if you encounter hills) you’ll no doubt find you have to slow down to a walk to stay in that heart rate zone.

It can be frustrating at first, but this is where patience and perseverance comes into play. Sometimes we have to check our ego, slow down, and learn to walk before we run…

Over time, with consistent training you’ll find that you can move at a faster pace while staying in your zone 2. You’re effectively becoming a more efficient, fat-burning machine. 

How to Track Your Zone 2 Training Progress

One of the best ways to track your progress with zone 2 training is to perform the MAF Test every 1-2 months time. 

  1. Find your Zone 2 threshold using the Z2 calculator above. 
  2. Record your running/walking/swimming/cycling pace over the course of a set distance, staying at the Z2 heart rate. This can be every mile for running, or a certain number of laps in a swimming pool.
  3. Note down your average pace for each milestone (e.g Mile 1 – 17:50, Mile 2 – 17:58, Mile 3 – 18.00).
  4.  Repeat the test every 1-2 months to measure your progress. 
Over time, you’ll start to see that you can perform at a higher pace while staying aerobic. 

Physical Adaptations from Zone 2 Training:

Some of the biggest adaptations from aerobic work are cardiovascular in nature:

  • Increased blood plasma volume, which subsequently increases stroke volume, oxygen transport, and VO2 max – the maximum amount of oxygen your body can utilise in a minute.

Aerobic training also causes metabolic adaptations:

  • Increased mitochondria density and size results in more efficient oxygen transportation, along with changes in enzyme activity; increasing the body’s capability to generate ATP aerobically and allowing you to sustain a higher percentage of your aerobic capacity without the build up of nasty lactic acid.
  • Despite spending little time in the high intensity heart rate zones, you already have that capability to improve there, and also to recover back to zone 2 more quickly after bursts of higher exertion.
  • Potentially increased oxidation of fat during rest and sub-maximal exercises, allowing you to use fat more efficiently as a fuel and preserve your glycogen stores for use during more intense bursts of activity.
  • Aerobic training can also bring your body into a more parasympathetic state compared to high intensity training; decreasing your sympathetic drive and allowing you to rest and recover more effectively.

Other adaptations include favourable changes in body composition, increased endurance performance, and psychological benefits.

Zone 2 Training Misconceptions

There are a number of misconceptions regarding zone 2 training that are worth mentioning:

Misconception 1: Aerobic training is not beneficial for high intensity sports and events.

  • With the exception of a few athletic events, no sport is purely anaerobic.The majority of athletes could benefit from including some aerobic work.
  • Just like with strength training, you don’t need to train at your max to improve your max. Improving your aerobic base will usually make you faster and more efficient in everything you do. There are countless examples of 5k and 10k athletes improving their times through Z2 base training alone.
  • When training for some sports such as MMA that seem to rely largely on the anaerobic systems, you should probably spend the majority of your time leading up to competition working anaerobically; but ideally this would only be introduced once that aerobic base has been established.

Misconception 2: Aerobic training causes you to lose strength + speed.

  • If all you’re doing is aerobic training everyday over a long time period, then your body will adapt to accommodate that. 
  • Your type 2a muscle fibres will become more efficient at performing aerobic work. But changes to your body don’t happen overnight. 
  • Mixing aerobic work in with strength, flexibility, and later anaerobic training will help you become a more well-rounded athlete.

Misconception 3: Tabata style HIIT training has been shown to be superior to Z2 steady-state.

  • A common argument is that the 1996 Tabata study shows training anaerobically breeds greater results in endurance and fat loss compared to steady state aerobic training.
  • If you look a little closer though, you’ll see that the ‘anaerobic’ group in the study also performed a total of 70 minutes steady state aerobic work per week.
  • The intensity of the anaerobic exercise was also extremely high, with subjects exercising at 170% of their VO2 max. When most people claim they are performing ‘Tabata’ workouts, they’re often not even getting close to that intensity…


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Where Does HIIT and Anaerobic Training fit in?

Anaerobic Training Benefits:

Generally speaking, anaerobic training sessions are shorter and more intense than aerobic sessions, and you’ll spend most of your working time above the aerobic threshold, with periods of rest in between periods of work.

The predominant adaptations that can be seen with high intensity, anaerobic training include:

  • Increased resting levels of ATP, creatine and glycogen.
  • Thickening of the wall of the left ventricle in the heart.
  • Increased muscle mass and bone density, plus an increase in muscular strength, improving speed and power.
  • Improved activity of enzymes that control that control the anaerobic phase of the breakdown of glucose as a fuel source, particularly in fast twitch muscle fibres.
  • Increased capacity to generate high levels of blood lactate during all out exercise, possibly due to increased levels of glycogen and an increased motivation to tolerate pain. This allows you to work at a high intensity for a longer duration.

As we can see, although many of these adaptations are beneficial, they’re quite different in nature to those seen with low intensity aerobic training.

How Anaerobic Adaptations Differ From Aerobic

Training anaerobically may increase your speed and ability to tolerate higher intensities for longer periods of time, but training aerobically increases the efficiency of your cardiovascular and respiratory systems, allowing you to work at a higher intensity without having to resort to using the anaerobic system as much.

This preserves your glycogen fuel source, and potentially puts lets stress on the central nervous system – which from my experience takes more of a battering with prolonged anaerobic training.

A great analogy I heard Simon Ward share on his podcast was this:

Aerobic zone 2 training is like raising the water level so a boat is higher up, whereas anaerobic training is like using a crane to lift the boat up instead.  

When the water level rises, the boat naturally sits higher without much effort, whereas a crane requires a high energy output to maintain that same elevation. 

Here’s yet another one of my expertly designed diagrams to demonstrate this:

Zone 2 Start
Zone 2 HIIT
Zone 2 Base Training Rise

The Potential Downsides of High Intensity Training

Although anaerobic training is definitely a great tool, using it incorrectly or introducing it too soon into an exercise program can potentially do more harm than good.

Excessive training intensity and abrupt changes in training volume may increase the risk for injury to bones, joints and muscles. 

Obviously low-intensity aerobic training also brings with it some risks: 

If your form is poor, those reps add up over a long run and can lead to overuse injuries. But the same can be said for high intensity work (and the risk of injury may be higher due to increased force production).

If not managed properly, excessive anaerobic training may encourage the body towards an acidic state, potentially due to the excess build up of lactic acid. This acidic environment is associated with inflammation and an increased risk of many chronic diseases.

Overtraining can also become an issue, with associated alterations in neuroendocrine and immune functions.

This can be a slippery slope, leading to chronic fatigue, poor exercise performance, frequent infections, and a general loss of interest in training.

The infamous Grey Zone of No Return

One of the most common issues we see in the health and fitness space is this:

People go too hard on their easy days, and too easy on their hard days.

They’re forever training in the ‘grey zone’ of no improvement.

The training intensity is not low enough to get the benefits of zone 2 cardio training, but not hard enough to induce significant anaerobic adaptations.

Always training this way leaves you with one speed, and takes your body to a state where it’s never quite rested enough to go hard when you really need it too.

I’ve definitely experienced this myself. 

Years of combining high intensity and grey zone training with inadequate rest has no doubt contributed towards some of the health issues and injuries I’ve faced.

So along with focussing on my core strength and flexibility, I’m now exploring the more laid back aerobic training approach to build my body back up.

The 80:20 Approach: Mixing HIIT with Zone 2 Training

For the average person looking to be a bit fitter and perhaps lose some weight, I like using the 80:20 approach for endurance training after an initial base-building period of 3-6 months. 

So around 80% of your time would be spent doing Z2 training, and the remaining 20% would be higher intensity work. 

For athletes that compete at a higher intensity, that ration may look more like 70:30 or 60:40, but it would still be built upon a solid aerobic base. 

My preferred way to build an aerobic base would be to go back to basics and forgo any high-intensity style training (aside from strength training), working solely on Z2 work for 3-6 months. 

By doing this, we become much more efficient athletes, and can work at a higher pace while placing less strain on the body.

As improvements in Z2 begin to slow, we would then introduce occasional interval style training 1-2 times per week. Faartlek, Tabata – whatever you enjoy, or whatever’s most relevant to your training goals. 

So to use my current training schedule as an example:

  • I spend the day standing and moving around at my standing desk – with regular breaks thrown in to do light bodyweight movements, short walks, mobility work, and moving meditation.
  • I do couple of barefoot zone 2 running session per week – one shorter and one longer, along with a longish walk, swim or paddleboard. 
  • In the evenings I’ll do some form of strength training, martial arts, climbing and maybe a couple of sprints or HIIT sessions thrown in here and there if I feel like I can recover fully (not often).

I’m not saying this is the ideal way to train for everyone, but the below as a general framework tends to work pretty well for me at the moment to enjoy a fairly well-balanced movement skillset.



Strength + Mobility


Z2 Run & BJJ


Rest & Walk


Strength & BJJ


Z2 Run


Climb / Surf Paddle / Walk


Depends on recovery 

Zone 2 Training and Nutrition

For the longest time in the world of endurance sports, it was believed that athletes needed to fill up on carbohydrates in order to perform at their best.

But that’s not necessarily the case.

This is something Maffetone was talking about in the 80’s has since seen a resurgence. 

We know that fat is the preferred fuel source when we’re working aerobically. So if we’re performing most of our training at an aerobic pace, do we really need to be filling up on a giant bowl of pasta prior to a long run, or shoving sugary energy gels down our necks every 15 minutes on a bike ride?

Probably not.

Instead, we might find that if we reduce the sugar, increase our fat intake and prioritize whole foods, we’ll feel and perform much better. 

I’m not going to tell you what to eat – it’s about finding your personal sweet spot. 

For some that might be fairly low carb or full blow keto. Others get on well with with a more balanced macro profile, or even adopting the carb backloading approach. 

The main takeaway is to test things out for yourself and find what works best for you.  

Zone 2 Training FAQS

Zone 2 Training: Over to You

High intensity training is alluring – allowing you to feel the burn and get work done in a shorter timeframe. 

No doubt.

But the truth is, working harder doesn’t necessarily always produce greater or faster results, and can potentially cause more harm than good. 

You can’t really do any significant damage by training too easily, but you can by training just a little too hard. 

For me, it makes sense that to achieve optimum health and to fulfil your athletic potential, it is safer to lay the foundations with a strong aerobic base, then build upon it with small amounts of high intensity work.

Chris Hauth, founder of AIMP Coaching, proponent of zone 2 training and coach of ultra endurance legend Rich Roll once said something along the lines of:

Build the base of your pyramid as wide and solid as you can, in order for the top to be as strong as possible.

I may have botched that quote a bit, but I think that sums it up quite nicely.

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Luke Jones

Luke Jones is a Movement Coach, Wellness Enthusiast, Online Content Creator, and Founder of HERO Movement. Through articles, videos, courses, and online coaching, his big goal is to help people discover freedom of movement and create lives filled with well-being & adventure.

25 Responses

  1. Nice article, reads super well such a hard thing to explain, can I post a link to this on my website? .. you quote ‘If not managed properly, excessive anaerobic training can also make the body very acidic, due to the excess build up of lactic acid. This acidic environment is associated with inflammation and an increased risk of many chronic diseases’ where is this cited from? … lactate is a survival mechanism tool that aids glycosis, it is not a fatigue byproduct not enough is posted out about this … It must not be forgotten that Aerobic training is optimal and preferable in training those overweight. The fitness industry makes people feel inadequate by not supporting aerobic zones of Hreats below 120 where ATP is utilising maximal fat and slow oxidative muscle fibres that produce the least lactate. Its sustainable its achievable and its the best zone for weight control and management, most of all its appropriate and safe … this is an important message.

    1. Thank you for your kind comments! Feel free to post a link or reblog, that would be great!

      With that particular quote, I’m not entirely sure of the exact source – a bit sloppy on my part. What I meant by that is that if you are not allowing for sufficient recovery, and always pushing your body hard enough to trigger lactic acid release, would this create a more acidic environment for the body? I meant it as more of a query, rather than a statement, but should have been a little clearer!

      Really enjoy your blog, keep up the great work!

  2. Great article, I’ve been building my aerobic base back up this year, feel a lot better for it. For about last 2/3 years I have done a lot of high intensity training (circuits/crossfit style training/tabata etc) – all this type of training seemed to do was make me tired and able to hurt myself in the gym even more – in shorts bursts albeit. Even though some of the training I was doing was really intense, I still got winded hiking up steep hills or playing sports or even doing extended manual labouor etc. I was lean and ‘looked fit’ but doing only that style of training gives you an ‘illusion’ of fitness IMO.

    1. Thanks James! Glad you’re feeling better for it!

      I’m in a pretty similar situation – spent a lot of time the past three years doing high intensity training, and got injured and run down from it.

      The high intensity stuff can definitely be useful, depending on your goals, but for me I definitely feel like it’s more sustainable and healthier to spend more time working that aerobic base.

      Have a great day!


  3. Hi! I am Lisa (46) from Germany. I just finished reading ‘ Finding Ultra ‘ today. I am very impressed about the big success with this kind of training. And it seems to be so logical. During the last few days I watched all the time my bip during running. It will not be easy to run so slow but I will try this method. I am very curious and will start next week as soon as I am back home from holidays. I only run Marathon and participated few times at short-distance Triathlons. My best finisher time was 03:30 – I have nothing to loose 🙂 I have plans to start in Frankfurt Marathon this autumn. I will let you know the results. Thank you so much for inspiering me. Lisa

    1. Hey Lisa, that’s awesome to hear! Hope everything went well with the marathon – would be interested to hear how things turned out for you using the zone 2 training!

  4. Great article, very easy to understand.

    After recently purchasing a HR monitor I was quite surprise to find that I was riding way too hard all the time and even what I thought was a steady pace, was actually about zone 4. I realised that in the 3 years i’ve been riding i’ve probably never really ridden in zone 2 for any real length of time.

    So this winter I am also beginning to train the aerobic system on all my long weekend rides with intervals during the week. It’s been eye opening (mainly how little power I can put out at zone 2) but i’m going to stick with it and see what the results are.

  5. A very clear article, thank you.

    I am a 79-yr old male who gave up jogging many years ago after jogging about 100 marathons and ultras and took up hiking instead. I am very grateful to still be alive and moving! I have not jogged in 16 years!

    On our honeymoon 30 years ago my wife and I ran in the Across the Years 24-hour run when my 50-yr old, poorly trained, badly fed and alcohol-pickled body travelled 80 miles. I think it would be cool to try and run 80 miles again when I am 80.

    Now I am plant powered, do not drink alcohol and have 24-hours a day for training. My favorite running shoes, Brooks Beasts (I walked from LA to NY in them) should arrive on Monday. What do you think we should do together?

    1. Inspiring stuff Alan! Apologies for the delayed reply!

      Would love to hear what crazy feat you and your wife decided to attempt next and how it went for you!

  6. super interesting read – thanks! Came across Zone 2 mentioned in the book Ultraman by Rich Roll – he swears by it so it must be good!

    1. Glad you enjoyed 🙂 Yep I’m pretty sure Rich and his Coach Chris were the ones who first introduced the Z2 idea to me. Definitely a useful tool to add to your training toolkit 🙂

  7. I “cant” run in Z2….
    If I walk fast, my hr stays around 115-120 bpm. If I run REALLY slow (slower than the walk) it goes up to 150. What should I do to train in Z2?

    1. Definitely no shame in walking at first to get your Z2 work in 🙂 Sometimes we have to take a few steps back or dial things right down so we can build that foundation. As your efficiency improves, you’ll find your pace improves (at the same HR). So it might go from a brisk walk to a gentle run, and progress from there 🙂 Hope that helps!

    2. I’m exactly at the same situation. Trying for the past half a year, I see improvements but very very slow. For example, it would take 30 sec of slow jog to reach 150 before, now it’s close to 2 mins. After those 2 mins, I need to walk again for about 30 secs, etc … still can’t jog continuously and stay below 150.

      How is your progress?

  8. I’ve been struggling to stay into Z2 during a run. I know of the improvements, as I’ve personally seen them with Z2 walking 2x per day every day for 3-4km with my dog for the past two years. I can easily walk 4km in about 55-ish minutes without exiting Z2, feeling winded, or sore. I just wish I could force myself to stay in Z2 during a run without feeling like a snail, or like people are snickering at my behind my back (at 43, I still have self-confidence issues).

  9. Ciao. the MAF 180 calculator of this article directly adds 10 beats if you opt for point D instead of the 5 beats indicated in the same method on Dr. Maffettone’s website. What is the reason for this difference in calculation? Thank you

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