The ability to maximally sprint is a proxy for overall health and vitality.

“do you feel like there is a single metric that is a better determinant for overall health or Vitality than the ability to maximally Sprint now not be fast but to go out and actually Sprint maximally think about all of the things that come along with the ride with that think about V2 Max like VO2 max in and of itself isn't important it's a proxy for all of these other things that are important the ability to Sprint maximally isn't necessarily important but it's a proxy for everything else I can't think of anything else and you're talking”