I know this one has been beat to death. But, usually the replies are very extreme without real strong reasons (explanations). One of my sons just started pitching (9 yr old). Being busy with other things, I didn't realize that he has been experimenting with curveballs. Figuring that he is probably not going to become Roger Clemmons, I thought, what the hell and had him pitch me a few. They were slow, but did brake in a nice vertical down with plenty of top rotation (the vertical down was probably due more to the slower velocity). But what impressed me most, was that he was able to throw them for strikes. My question; is this really dangerous? If so, why is this any more dangerous than 13 yr old kids throwing them (the seemingly universal age everyone agrees to let kids begin throwing breaking balls). His cross-seam fastball is about 50 mph and although I haven't checked his curveball,I would say it is 10 or so mph less. I know the other reason coaches and people in the "know" give, is that they will never achieve arm strength by messing around with breaking balls and change-ups. I find that argument hard to accept. A kid throwing curve balls once in a while isn't going to stop him from getting a good workout. Again, I am worried more about him hurting his arm. Is this any more a risk than having him wait a few years (not sure if I can anyway) ?
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