It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
Engage your core muscles, then curl your upper body towards a sitting position.
调动人体核心部位的肌肉力量向上抬体，成坐姿。
Engage your core muscles, then curl your upper body towards a sitting position.
调动人体核心部位的肌肉力量向上抬体，成坐姿。
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