VO2max as a biological-age marker

Peak oxygen uptake falls about 3% to 6% a decade in your 20s and 30s, and over 20% a decade past 70.

Who it's forAny man whose watch just handed him a fitness age older than he is.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.