Throwing a baseball or softball is one of the most difficult activities in sports and requires extreme accuracy and skill. It is also one of the most unnatural motions in sports and leads to many injuries, especially among baseball pitchers.
The speed of the pitching shoulder in baseball has been shown to reach 6900 degrees per second in youth pitchers (and higher speeds in adult pitchers). That is equivalent to spinning your arm in a circle approximately 19 times in 1 second (or about half the time it took to read this last sentence). With speeds that fast, it is no surprise that shoulder and elbow injuries are common. One way to decrease injury risk is to perform an off-season throwing program that gradually builds arm strength and prepares a thrower or pitcher for their season
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