Only percent of the food eaten is turned into its own body. *

Certain percent of the food eaten is turned into its own body

This makes the most sense, obviously it could be something different. And I don’t disagree with you, but this makes sense

Hope this helps ♥︎

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)