Strengthening these muscles with a series of eye exercises will prevent eye strain effectively.

通过一系列眼部运动来增强这些肌肉，可以有效预防眼睛疲劳。

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When we do the same movements with our bodies over and over again, we overuse some muscles and that overuse can lead to strain and injury.

当我们的身体一遍又一遍地做同样的动作时，会过度使用一些肌肉，从而导致劳损和受伤。

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You should try not to place too much strain on muscles and joints.

你要尽量不让肌肉和关节太吃力。

《牛津词典》

For cardiovascular exercise, weight-bearing, higher-impact activities such as walking, jogging and aerobics are better than nonweight-bearing or lower-impact exercise such as swimming, cycling and elliptical machines, which put less strain on your muscles and bones.

CNN: How much weight is needed to strengthen my bones?

But just as striking for me has been the experience of sitting no more than a metre and a half away from Oscar Pistorius - able to hear his breathing patterns, his sobs, muttered prayers, and to see the muscles strain on his neck as he stares forward, with the concentration you would expect from someone braced for the start of an Olympic final.

BBC: Oscar Pistorius: Drama of the courtroom

"It might sound ridiculous, but people do pull muscles and strain things by mopping the floor, because it is intense, " says Jay Roper, a leader of the team of volleyball moppers from Sheffield.

WSJ: When These Olympians Say Their Job Is 'No Sweat,' They Mean It