Exercise is important for muscles because it

Exercise plays a vital role in building and maintaining strong muscles and bones. Physical activity like weight lifting can stimulate muscle building when paired with adequate protein intake. This is because exercise helps release hormones that promote the ability of your muscles to absorb amino acids.

Helps release that promote the ability of your muscles to absorb amino acids.

Explanation:

Exercise plays a vital role in building and maintaining strong muscles and bones hormones

thinking it would be physical characteristics