For each exercise, be sure to warm up first, keep abs tight, breathe, and not lock elbows or knees.

每次练习都要先做热身，收腹，调整呼吸，并且肘部和膝盖不能弯曲锁定。

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When you do it in a standing position, keep your abs and lower back tight to support your spine.

当你站在它的位置，让您的绝对值和腰部紧来支持你的脊椎。

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When you do it in a standing position, keep your abs and lower back tight to support your spine.

当你站在它的位置，让您的绝对值和腰部紧来支持你的脊椎。

youdao