[討論] 有人用過Hitting Jack-it嗎?
http://www.appledaily.com.tw/appledaily/article/sports/20130111/34763467/
如上面連結說明，聽球員說起來好像蠻有用的，
但對業餘的來說會不會成果有限??
不知道有沒有賢拜玩過這東西的?
在Y拍有看到，還有分重量，感覺訓練的功用也不太一樣;
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