Hypertrophy

Hypertrophy is the technical term for muscle growth — specifically the increase in the size of muscle fibers after repeated stress through resistance training. In bodybuilding, training is geared toward maximizing hypertrophy by using moderate weights, moderate-to-high reps (typically 6–15), short rest periods, and controlled form. Nutrition, sleep, and recovery are just as important, as muscle growth happens outside the gym.