Strength training trains the ability to exert force to overcome resistance. Strength can be trained with various training modes, ranging from body weight to strength training machines and free weights. In this series of videos, Colin Herbert defines strength training, discusses the difference between size and strength gains, outlines the principles of specificity and how and when strength training becomes specific.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 musclesstimulation and repair. In this series of videos, Colin Herbert explains what Hypertrophy is, how hypertrophy in muscles occurs, how muscle fibres grow, provides an insight into metabolic stress, and discusses muscle damage and repair through hypertrophy training.