As an trainer who works with a large number of youth baseball players I know the story. Your son takes pitching lessons and now has amazing delivery on the mound. He is also apart of sports performance program to increase his relative strength and flexibility. Here’s the thing…it doesn’t matter your son still has to be on a strict pitch count. Because if he is not, he is increasing the risk of injury to his elbow or shoulder (scientifically proven!). Here are a few amazing stats from this article I’m recommending all parents and coaches should read. Here’s the article. Here’s the facts according to this article:
In a study by Andrews and Fleisig (1999) 476 youth pitchers between the ages of 9 and 14 were closely examined. “Over the course of the season, more than half of the pitchers experienced shoulder or elbow pain. For each increment of 25 pitches thrown after 50 pitches, the percentage of pitchers experiencing pain increased as fatigue set in. Those who threw curveballs were 52% more likely to feel shoulder pain. Those who threw sliders were 86% more likely to endure elbow pain.”

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