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.

You're relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it's a muscle in your arm, your leg, or ...

Leg twitching is a sudden contraction or release of a muscle. Leg twitching when trying to relax can sometimes be a sign of a health condition, such as restless leg syndrome. When signal misfires ...

Picture this: You’re lying in bed, *just* about to fall asleep, when your leg starts to cramp. The contractions, the twisting, the spasms, ugh! Naturally, you start to wonder, what causes leg cramps ...