Recording simple Numbers such as the number of push-ups, sit-ups or speed you can run can help you see that the exercise is making you stronger and faster.

记录俯卧撑、仰卧起坐或是跑步速度等简单的数值，都会让你发现体育锻炼是如何使你变得更强更快的。

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Whether or not they provide you with precisely the physique or fitness you desire, could sit-ups bring unintended consequences such as back pain?

不管仰卧起坐是否真的能助你实现你想要的体格或健身效果，它们有可能带来意想不到的后果，如背部疼痛。

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Warm up inside, and incorporate stretches (especially for the hamstrings) as well as core-strengthening exercises such as mini sit-ups, crunches, or working an exercise ball.

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Mr. White also suggests using commercial breaks to do push-ups, sit-ups, or burpees (also known as thrust squats).

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