[技術] 發球的屈膝？
自己發球都會有屈膝的習慣(其實這是該有的動作吧XD)
但是最近一直發現練發球發完去休息左膝蓋會有一點怪怪的，隔一兩天也都一樣
，過個大概一星期就會恢復。
請問這是我屈膝的方式不對還是..........= =?
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