eli5 how does building muscle make it so you can lift more?

Question

right now i couldnt curl a 30 pound dumbell 5 times but if i trained for a year i could, how?

In: Biology

Answer 1

Each time you work out the muscle, some of the fibers break. When this happens, your body doesn’t just replace those broken ones but actually builds a little more than you had before. Do that enough and the muscle will noticeably grow in size and strength.