Doing regular pushups can help in building muscles because when you do a pushup you're basically targeting your biceps, shoulder and forearms, and the more intensive your push up is, the more you'll make those targeted muscle group stronger.
You also have to compliment it with food, so majority of your food has to be protein because it contains amino acid and that's what causes muscles to grow, you can't grow your muscles if all you do is pushups and binge eating carbohydrates.
You also have to compliment it with food, so majority of your food has to be protein because it contains amino acid and that's what causes muscles to grow, you can't grow your muscles if all you do is pushups and binge eating carbohydrates.