Muscle hypertrophy is a term for the growth and increase of the size of muscle cells. The most common type of muscular hypertrophy occurs as a result of physical exercise such as weightlifting, and there are two essential components necessary for the growth of muscles—stimulation and repair. In this series of videos, Colin Herbert explains how training volume affects hypertrophy, how the time under tension influences hypertrophy, how range of motion can affect hypertrophy, and the influence of training frequency on muscle growth.