Although effort is required to bend a joint or flex a muscle, the body is able to recycle much of the energy expended through spring-like tendons and elegantly arranged muscles.
尽管需要花力气去弯曲关节或拉伸肌肉，但人体可以利用弹簧般的肌腱和分布优雅的肌肉来回收相当部分的能量。
And based on that, when the brain sends a signal to the muscle to flex, even though we don't see it, Luna is still able to detect it.
而在此基础上，当大脑给肌肉发出弯曲信号，即使我们看不到，月神还是能够探测到。
The elderly are tend to flex hip joint more and use hip extensor muscle to propel the body forward.
老年人在上坡时倾向以弯曲髋关节，多用髋伸直肌群的策略使重心向前，身体推进。
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