Provides basic information on muscles and includes discussions on muscle diseases, how to change the size of muscles, and different kinds of muscles.

Different types of muscles -- Healthy muscles -- Exercise and muscles -- Skeletal muscles -- Inside a muscle -- Muscle attachments -- Working muscles -- When a muscle contracts -- Athletes' muscles -- Bodybuilding -- Muscle problems -- Muscles of the face and head -- The chest muscles -- The heart muscle -- Abdominal muscles -- Internal involuntary muscles -- Arm and hand muscles -- Leg and foot muscles -- Muscle diseases and problems -- What can go wrong with the muscles?