Peter Attia's heart rate reaches within two beats of his maximum heart rate at the end of his one-minute near VO2 max efforts during HIIT.

“what's your current V2 Max workout so you mentioned kind of three to eight minutes on is it typically I do four on four off is is sort of where I spend most of my time sometimes three on three off on a rowing machine um these days um and sometimes by the way I just am in a bit of a rush and I'll just do one minute on two minute off at a much higher intensity on the stair climber”

“typically I do four on, four off is is sort of where I'm spend most of my time. Sometimes three on, three off on a rowing machine. Um, but these days, um, and sometimes, by the way, I just am in a bit of a rush and I'll just do one minute on, twom minute off at a much higher intensity on the stair climber.”