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We often experience cramps in our leg muscles after a vigorous excercise cuz one of the muscles or a group of muscles contracts forcibly and does not stop contracting. this can be a brief and annoying sensation or a sharp pain if the cramp is more severe. severe cramps can cause the muscle to contact so strongly  that it knots and forms a lump under the skin. cramps can come and go for several minutes. leg cramps are common experience for athletes.
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It is due to after vigorous exercise the oxygen is not distributed equally to all parts and so there is over secretion of lactic acid which causes cramps in our body.
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