When you use your muscles beyond what they can handle, either through aerobic exercise or weight bearing exercise, it causes your body to build new muscle tissue.
当你用你的肌肉做些有难度的活动时，不论是有氧运动还是负重运动，都会让你的身体建立新的肌肉组织。
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。
When you do one month of regular exercise, your body ditches those excess fats and gains muscle.
当你做一个月的定期运动之后，你的身体会清除那些多余的脂肪，让你身体的肌肉增多。
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