re: Explain it to me like I’m 5 - Running edition

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so it goes back to original question how should one measure that zone 2 training is working?

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Peter Attia on Zone 2

This will be more information than you probably need. My measurement that I am using is my VO2 max. I want to try and increase it as much as possible before I hit age 70.

I ran all last year using a different coach's HR targets: 140-160 for zone 2 and 180+ for VO2 max. While my VO2 did go up, it was marginal. I'm trying this for 6 months and will retest again in April to see if it moves the needle.