Check your understanding of how energy systems in muscle cells work with this quiz. Brush up on your knowledge of lactate metabolism, oxygen debt and different types of muscle fibres with this Higher ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Flexing your muscles is more than just a way to show off the results of your strength training workouts. It can also be a way to build strength. Muscle flexing is more accurately known as muscle ...

Muscle knots are hard, sensitive areas of muscles that tighten and contract even when the muscle is at rest. These tense muscle fibers can cause pain in other parts of the body when touched. Muscle ...