坐着要求肌肉使躯干、颈部和肩部保持在固定的位置。

Sitting requires the muscles to hold the trunk, neck and shoulders in a fixed position.

youdao

原因是其中的腿部、躯干和颈部的动作在本质上是相同的，虽然当你的天地颠倒之后，感觉就完全不同。

The actions of the legs, torso, and neck are essentially the same in both poses, although these actions feel different when you turn topsy-turvy and reverse your body's relationship to gravity.

youdao

手臂和躯干向前伸展。双手放在地面上。颈部放松。

Stretch your arms and torso forward. Hands on the floor. Soften your neck.

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