muscle spasms can occur from a variety of conditions. the most common after or during exercise is neuromuscular fatigue. this occurs after the nerves have basically overloaded the circuits into the muscles. the muscles go into spasms and with rest the symptoms resolve. other reasons for muscle spasms are an electrolyte imbalance or a nerve is being pinched. if your symptoms persist i would see your local physician.
what causes muscle spasms?