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Peter Attia on Zone 2 and Zone 5 Training

The overall take away from this article is that you don't need to kill yourself everyday on the bike, treadmill, or weight machines. The correct balance of exercise and physical activity should be slow and easy most of the time and then hard and fast for less of the time. This is how to achieve optimal health, fitness, and longevity benefits.


Zone 1 is 50-60% HRM (Heart Rate Max), Zone 2 is 60%-70% HRM, and Zone 5 is 90-100% HRM. You don't have to use a lactate meter to know you are doing Zone 2, a simple heart rate monitor or subjective check-in to your effort expenditure is plenty; the point is to go hard enough to where you feel like you need to increase breathing but not feel terrible burn or no burn at all; a pace you can sustain for a few hours, but with some effort. As for zone 5 training, don't worry about spending hours in this zone, more like seconds. The key is to push yourself hard every now and then, preferably keep these hard pushes under 1 minute with plenty of recovery time in-between; sprinting or some really hard exercise type either on land, bike, or in the water is what you are looking for here.


How do you calculate your HRM? A simple 220 minus your age is a great way to judge your HRM. This means Zone 1 for a 40 year old should be around 90BPM to 108, something you could achieve with some upbeat gardening or medium paced walking around the block.

What is Peter optimizing for with his exercise?

  • Everything Peter is talking about in terms of exercise is about optimizing for longevity

  • That is much different that optimizing for performance

  • For instance, if someone were to want to run the fastest 10k possible…

    • That means training at an energy system that is very demanding of the cardiovascular system.

    • It is pretty much maximum cardiac output just beneath VO2 max above functional threshold which is past the point of optimizing longevity returns and it actually comes at some cost to longevity relative to something more at a slightly lower energy system

  • Instead, Peter thinks about training for the Centenarian Decathlon⇒ i.e., being a kickass 90 year old


The main energy systems of life:

  • Zone 1

  • Zone 2

  • Zone 5


“By training zone 2 and zone 5 . . . we’re really teeing ourselves up metabolically and also structurally to do these things.”


Exercise components—Zone 2 and zone 5 training


Zone 2 training


Make sure to check out the podcast with Iñigo San Millán

  • Iñigo explains that zone 2 is basically the highest level of exertion that is effectively pure mitochondrial oxidative phosphorylation before you start to net accumulate lactate


-How Peter does zone 2 training:

  • Peter does zone 2 about four times per week 

  • He uses a lactate meter to make sure he is right on that limit of not going too far, not pushing too hard, but pushing hard enough

  • Usually he does it on a stationary bike that’s hooked up to a power meter where he’s titrating watts and heart rate to get to a point where his finger stick lactate level is 1.8 or 1.9 milliMole

  • If done on a treadmill, he’s doing 15% incline at about 3.0 to 3.4 miles per hour to produce the same effect as the bike

  • Can also be done on an elliptical


-What is the right dose of zone 2?

  • For a beginner: ~2 hours a week is a good place to start

  • Ideally: 3-4 hours per week 

  • But you probably can’t do too much zone 2, says Peter, you’re mostly just limited by time and the ability to allocate it towards other forms of exercise


Zone 5 training

  • Zone 5 is high intensity zone (i.e., HIIT) and the fourth and final piece of exercise

  • You don’t need to be spending much time in zone 5, but to neglect it completely, you’ll probably pay a bit of a price, says Peter

  • Peter describes this zone as a small part of life using the example of an escalator being broken and you have two pieces of luggage and your kid and you’re late for your flight


-HIIT vs aerobic exercise:

  • Many of the studies on this focus on its comparability to aerobics exercise on a minute per minute or unit time basis. 

  • HIIT is more efficient when looking at it that way

  • But Peter does not view it as an either/or situation

  • Using both of these tools is optimal and especially when zone 5 training doesn’t require that much more time


Peter summarizes his typical week of exercise:

  • 3-5 bouts of strength training

  • 4 bouts of zone 2

  • 2 bouts of zone 5

  • Stability is sprinkled into pretty much every day with maybe one day of a longer, more dedicated 60-minute session around stability

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Dr. Rick Cohen

December 22, 2022

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