[mrgoldenbrown]

Exertion does not actually imply discomfort for everyone (maybe it does for you , I'm not in your body). I would argue most people dancing in a club are doing it because it's fun, not painful. Same with kids splashing in a pool, or anyone playing DDR or beat saber, etc. People have voluntarily exercised throughout history. Certainly it was easier when I was younger, and the endorphins overpowered any pain. I have to be more deliberate now in my old age but there are still plenty of non painful ways to move my body.