[技術] 請教發球 [附影片]
不好意思小弟是新手，我知道我的發球很不協調很多地方要改正
但礙於沒有預算請教練所以都只能自己練習
可以請教一下小弟的問題很嚴重嗎↓
http://ppt.cc/mtLS
可以另外再請問該怎麼該善嗎? 感激不盡!!!!!
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