A muscle cramp, known colloquially as a charley horse, occurs when a muscle contracts and doesn't immediately relax.
http://www.modbee.com/2013/06/27/2783198/tips-for-preventing-easing-leg.html#storylink=rss
http://www.modbee.com/2013/06/27/2783198/tips-for-preventing-easing-leg.html#storylink=rss
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