Peter Attia

I discussed this on a podcast as well.

So I guess I hope that clarifies kind of the context around one versus the other.

Once you're not constrained by that 150 minutes per week, and honestly, that's my hope.

My hope is that everybody listening to us right now, even though once in a while they might be constrained by that, but that they can find more time to exercise, the limiting factors start to become fatigue,

and recoverability, and even to some extent adherence.

And I think that especially as you get older, fatigue and recoverability become real limiting factors.

So higher intensity workout, workout in zone five, very important and should always be a part of your training.

You can't do that much of it once you get into your 40s and 50s.

When you're in your 20s and even into your 30s, you can still hammer these workouts.

But I can't do those workouts three or four times a week anymore.

And I don't think most people listening right now can either.

So if you're going to be able to devote more time to your training, you're going to have to be able to do so at a lower physiologic cost.

And again, volume drives adaptation.

That's the thing to remember.

It's volume above all else that's driving adaptation, provided that volume is at least at zone two, where you start to undergo all those changes we discussed.

So basically there's a cost of doing high intensity work.

And by the way, part of that is an adherence based.

It's more painful, it's more fatiguing, and it's harder to sustain.

So one of the things I tell patients who are bored when they're doing zone two is, look, use it as an opportunity to get really caught up on your favorite podcast or your favorite audio book or something like that.

Something that frankly is a little bit harder to do during a high intensity workout where you're probably not as able to concentrate about it.