Prolonged sitting can aggravate the injury, as can a tight lower back.
久坐会加重这个问题，因为久坐会让腰背部紧张。
Maintain the natural curve in your lower back, and keep your core muscles tight.
保持腰背部的自然弯曲，保持收紧你的核心肌肉。
Maintain the natural curve in your lower back, and keep your core muscles tight.
保持腰背部的自然弯曲，保持收紧你的核心肌肉。
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