With or without back support, do not arch your back.
无论有没有回来支持，不拱你的背部。
Make this action strong, but don't let it cause your front ribs to jut forward or arch your low back.
做这个动作应该有力量，但不要引起肋骨外翻或者下背部成拱形。
Press down on the mat with your hands, gently increasing the arch in your back.
这时，双手紧压地面，轻轻向后弓背，增加弧度。
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