正如同你的二头肌一样，如果你不断锻炼大脑，二头肌就会更加强壮，反映也会更加迅速。
Just like your biceps, if you exercise the brain, it gets stronger and responds more quickly.
上坡跑会打破你的节奏，强迫你的肌肉去调整适应新的压力。结果就是，它会使你会变的更加强壮。
Running hills breaks up your rhythm and forces your muscles to adapt to new stresses. The result? You become stronger.
增加肌肉会让你变的更加强壮更加健康，但不是更大体型。
By adding extra muscle to your body, you become stronger and fitter, but not necessarily 'big "."
增加肌肉会让你变的更加强壮更加健康，但不是更大体型。
By adding extra muscle to your body, you become stronger and fitter, but not necessarily 'big "."
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