How does lifting weights make muscles bigger?

Answer 1

when you lift weights you tear the tiny fibers that make up your muscle. your body responds to this by taking protein from the foods or supplements you take in and goes through a process called protein synthesis. Combining the protein molecules to the fibers helps grow the fibers bigger and stronger because your body figures it needs to adapt to the new stress, thus causing muscles to hardin and become stronger.

Answer 2

Yes, they break down muscles then they repair tougher.