My Sophomore son's coach is trying to turn him into a sidearm pitcher. Whenever he pitches at practice his arm hurts and he tells the coaches but they say he needs to build arm strength. His arm has never hurt before when pitching. I told him if it hurts tell them you can't do it. He has been very successful throwing at 3/4 slot and never any pain. Should I be concerned or trust the coaches. Common sense tells me protect his arm.
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