[問題] 投球左肩開太快(右投)~
左肩開太快是什麼意思呢?
是?投球時身體旋轉太快?手臂尚未轉向前~球就出去了?
那~要怎麼改善~這個問題??
附上影片~ http://www.wretch.cc/album/album.php?id=luen85457296&book=1
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