Bend your arms at elbows. Let them swing from the shoulders with each step.

胳臂和肘要弯曲，使它们随着每一步以肩为轴进行摆动。

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Walk forward. That means tilt slightly forward from the waist when walking. Bend your arms at the elbow and pump them as you walk. This helps to create momentum and balance.

走路时腰部以上微微前倾 ，肘关节自然弯曲摆动，这有利于产生动力并平衡身体。

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The keyboard is too high, which makes your arms reach up, your shoulders hunch and your wrists bend down.

键盘放得太高，你必须把胳膊伸得老高，耸起肩膀弯着手腕。

youdao

With a tandem jump you sign a release form, put on a jumpsuit and are quickly shown what to do once you leave the plane: how to cross your arms and bend your legs while in mid-air.

BBC: Falling into New Zealand, from 10,000 feet