不標準。肩和胸要繼續打開，胸上提。後彎的潛在危險是腰間盤問題。如果肩胸跨都緊，勢必在腰彎折，這是要避免的。

來源: lawattaction 於 2019-05-02 10:09:33 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.