Why do your muscles cramp after exercising?

Muscle twitches after exercises have the scientific name of benign fasciculations. Benign fasciculations can occur even in the absence of exercise, although exercise is a well known trigger of this condition. Benign fasciculations usually involve the feet, hands, arms, or legs, although almost any muscle can be affected. By their very definition, they are benign and aren't indicative of serious underlying disease.

Benign fasciculations or muscle twitches after exercise is surprisingly common. After the muscles have undergone an intense workout, biochemical changes take place as the muscle responds to the stress of exercised Lactic acid builds up in the fatigued muscle and formation of free radicals occur which believe can alter the excitability of muscle tissue.