A proper amount of exercise contributes to good health.

适度的运动有益健康。

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A study published recently shows that a proper amount of exercise contributes to good health.

最近出版的一份研究表明适度的运动有益健康。

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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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