is any body movement produced by skeletal muscles regardless of the level of energy expenditure. Group of answer choices

1. exercise

2. health related fitness

3. physical fitness

4. physical activity

Physical activity i think, pls dont come at me

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)