In this video, Dr Mike outlines the 3 types of skeletal muscle hypertrophy in response to resistance training (weightlifting):
1) Myofibrillar hypertrophy
2) Connective tissue hypertrophy
3) Sarcoplasmic hypertrophy
He also explains how different types of stimuli can produce hypertrophy;
1) Mechanical tension
2) Metabolic stress
3) Muscle damage