Health is my major core value that I commit to for my entire life/

A commitment of that length has to change shape several times or it does not survive.

At twenty-five it means a five-a-side game and not much thought. At forty it is mostly sleep. At seventy it might be a handrail by the front step and a loop around the block that takes longer than it used to and still counts.

The people who keep it are rarely the most disciplined ones. They are the ones who let the definition move. Rigid versions snap the first time the body changes the terms, and the body always changes the terms.