Question

how does muscles build back stronger? Explain how.

Answer 1

The process of muscle growth (also called muscle hypertrophy) occurs when muscles are stimulated through stress and training, which causes them to expand and adapt in order to handle resistance.

There is a more detailed explanation of the process on this article, though there is a note that some of the exact mechanics behind strength training and muscle growth are not fully understood: https://en.wikipedia.org/wiki/Muscle_hypertrophy

Answer 2

its kinda like they break down and then while your sleeping they build back up stronger