An abdominal muscle strain is an injury that happens when muscles in your stomach area stretch too much or tear. You might also hear it called a pulled stomach muscle. Anyone can strain a stomach ...

Muscle cramps are a common issue that many people get from time to time. If one of your muscles feels like it’s contracting (getting tight) for no reason — and you can’t get it to relax — that’s a ...

A muscle spasm — also known as a charley horse, muscle cramp or twitch — is a sudden, involuntary movement in one or more muscles. Common causes include stress, exercise, or dehydration, but nerve ...

Human movement is reciprocal in nature: Opposing muscle groups must coordinate for proper movement. Muscle length and strength between opposing muscle groups need to be in balance for normal movement ...