You can do this with your calf muscles, thigh muscles (front and back), chest, abdomen, buttocks, shoulders and back.

你可以对你的小腿肌肉、大腿肌肉（前面和后面）、胸部、腹部、臀部、肩部和背部这么做。

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The parts of the body that require special attention are the muscles of the shoulder and arms, abdomen and back, legs, and the heart, lungs and blood vessels.

锻炼期间我们要注意肩部，手臂，腹部，后背，腿部的肌肉，以及心脏，肺和血管。

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Do this correctly by using the muscles of your abdomen and the ones between your ribs (intercostals) to squeeze more air out of your lungs as you exhale.

深呼吸的方法要正确，你要用你的丹田和肋间的肌肉来从肺部挤压出更多的空气。

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Cramps (tightening of a muscle) happen most frequently in calf or thigh muscles but may affect other muscles such as those in the hands, feet, abdomen or rib cage.

CNN: What causes muscle cramps?