“Muscles grow for a variety of reasons, but the main one is strength. If you force them to get stronger, they will get bigger. If you start lifting 100 pounds five times, but train your body to lift 150 pounds five times, you’re going to end up with bigger muscles. But if you start off lifting 50 pounds ten times, and progress to lifting the same 50 pounds fifteen times, all you’ve done is increase the endurance of the muscles, which by itself will not make them bigger.”
―
Lou Schuler,
The New Rules of Lifting for Women: Lift Like a Man, Look Like a Goddess