How does lifting something heavy build muscle?

Question

How does lifting something heavy build muscle?

In: Biology

Answer 1

ELI5:

Your body picks up a heavy thing repeatedly and muscles tear under the stress.

Your body recognizes that you now pick up that heavy thing repeatedly to stay alive, it dedicates resources to regrowing those muscles that were torn and build enough new ones to handle picking up that weight so you don’t die.

Repeat.