c*******s
发帖数: 127 | 1 Did some practice on serve and tried to add more shoulder rotation. As a
result, I had Left Side Hip or Low Back Pain.
I know I should bent my knees to generate the power. But I felt my left
knee painful. So I did not do much knee bending, instead of, I did some 送
左骻（hip）。 Recently I feel very hurt on my left side hip/low back.
Any one have such experience? What should do if can not bend knee much?
Can only sever without should rotation?
Thanks. | b*e
发帖数: 3845 | 2 My shoulder rotation is relatively small. I did sometime 送左骻（hip) if I'm not lazy. Most of my flat serve power comes from a loose arm, that
includes upper arm, forearm and wrist. Though my service motion is not
beatiful, it's simplified and effective in many occassions.
【在 c*******s 的大作中提到】
: Did some practice on serve and tried to add more shoulder rotation. As a
: result, I had Left Side Hip or Low Back Pain.
: I know I should bent my knees to generate the power. But I felt my left
: knee painful. So I did not do much knee bending, instead of, I did some 送
: 左骻（hip）。 Recently I feel very hurt on my left side hip/low back.
: Any one have such experience? What should do if can not bend knee much?
: Can only sever without should rotation?
: Thanks.
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