Hormesis [1] is defined as a favorable biological response to low exposures to stressors and it is a fundamental concept in biology that applies at any given "r

Hormesis [1] is defined as a favorable biological response to low exposures to stressors and it is a fundamental concept in biology that applies at any given "resolution", so we have hormesis at the cell level up to hormesis at the whole body level. In this tense, exercise is just an stressor and the key here is the amount of exercise: Too little and the hormetic response is not triggered; too much, and your body is not able to cope with it. Given this, it is quite difficult to say if exercise, without any qualifier, is good or bad. [1] https://en.wikipedia.org/wiki/Hormesis https://en.wikipedia.org/wiki/Hormesis