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。

youdao

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。

youdao