[問題] 發球姿勢改一下應該就不會被判踩線了
就是用像山普拉斯阿格西跟費德爾那種方式，
右腳不往前縮，雙腳站定直接蹬上去發球，
應該就比較不會腳踩線，
一般會腳踩線就是右腳往前時,整個前頃,
導致左腳也稍微往前移然後就踩線，
像費神,henin用直接站定往上蹬的方式發也是球很強，
不過我自己也不是用這種方式發球，
因為以前教練教就是跟小威這種發法一樣，
右腳前縮後再往上蹬，我有試過直接站定，腳不前縮，往上蹬發，
但是很不習慣，變得不太會發，
但是有球友本來跟我一樣的發球方式，
後來也是改成站定直接往上蹬起來發球，
我想要改也是可以，只是我是打消遣的，就不太想再花時間改，
而我也倒是常常踩線發球就是了～
我覺得以後選手可以多用這種直接站定，向上蹬起來發球，
我覺得右腳先往前縮，再蹬發並沒有特別有優勢，
反而增加踩線危險。
建議以後想學發球，學直接站定，蹲低，蹬發，
發球動作應該是越簡單越好，
個人淺見～
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