你应“删除”几乎所有的东西,保持曲线接近底部区域。
You should "erase" almost everything, keeping the area near bottom curve.
它保持不变,因为点在曲线上移动。
在你站起来的时候,继续保持腰背部的自然曲线,保持收紧你的核心肌肉。
As you stand, maintain the natural curve in your lower back and keep your core muscles tight.
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