It's not that huge of a win, roughly 9-10 of that extra 13 percent is spent in the bathroom. Study finds relaxing on the throne decreases mortality?
You develop tolerance to exercise, is that not healthy?
If you've never done squats before, go do a couple reps. You probably will be sore and stiff for the next 4 days. Keep it up and one will develop a tolerance and (generally) have a healthier body than if one didnt do any kind of exercise.
That is quite different from introducing a foreign substance into your body and coping with the consequences.