There are several theories, but by far the most popular one is the Muscle Pump Theory.
有几种理论，但目前最流行的是肌肉运动的理论。
Want to build muscle fast? What you eat - as well as how much iron you pump - can make a huge difference to your success.
想快速拥有肌肉？你吃什么-和你输送多少铁-会对你能否拥有肌肉成功产生巨大的不同。
Your heart is a muscle with fibers that allow it to contract and pump blood.
你的心是一种纤维，使其收缩，血液循环肌肉。
Your heart is a muscle with fibers that allow it to contract and pump blood.
你的心是一种纤维，使其收缩，血液循环肌肉。
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