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.

The misconception that muscle can be lean or bulky lies in its appearance. “When people (say ‘lean’), they’re usually ...

Skeletal muscle is the type of muscle that controls movement. Problems with these muscles can be minor, life-threatening, or ongoing problems that make it hard to perform basic daily activities.

If your fitness goal is to up the ante on endurance, pack more power into your sprint, or supercharge your strength gains in the gym, it’s worth exploring – what are the different muscle fiber types?

Myopathy describes disorders of the muscles that cause them to function less effectively. Myopathies can be inherited or acquired, and the symptoms may be present from birth or develop later on.

Amyotrophic lateral sclerosis (ALS) affects the nerve cells in the brain and spinal cord that control muscle movement. Different types of ALS cause symptoms to begin in a certain part of the body and ...