A muscle cramp is an involuntarily and forcibly contracted muscle that does not relax. Muscle cramps normally last from a few seconds to up to fifteen minutes. On rare occurrences they can last longer than fifteen minutes. A cramp can persist numerous times until it eventually goes away. Cramps can effect the muscles differently - for instance it can affect a group of muscles, a single muscle, or even a specific part of a muscle.
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Cramps can effect the muscles differently - for instance it can affect a group of muscles a single muscle or even a specific part of a muscle.
抽筋会在不同程度影响肌肉，比如一组肌群，一块单独的肌肉，甚至一块肌肉的某个部分。
Cramps can effect the muscles differently - for instance it can affect a group of muscles, a single muscle, or even a specific part of a muscle.
抽筋会在不同程度影响肌肉，比如一组肌群，一块单独的肌肉，甚至一块肌肉的某个部分。
When you're using the proper weight or amount of resistance, you can build and tone muscle just as efficiently with a single set of 12 repetitions as you can with more sets of the same exercise.
只要进行正确适量的力量或耐力练习，只做一组12次联系(而不是更多组同样的练习)就可以帮你塑造肌肉并保持健美。
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