Agreed, but ability to adapt to exercise is also very personal. I have a natural endurance for things like running, but other people don't (just like some peopl

Agreed, but ability to adapt to exercise is also very personal. I have a natural endurance for things like running, but other people don't (just like some people can gain muscle mass just by looking at a barbell, while others -- like me -- need to put in consistent, hard work in the gym to slowly build strength.)