How many times have you heard a coach say "Hurry up and throw so we can get started guys". What is the message that you are sending your players when you tell them that? I think the answer is obvious. Kids start at a young age, they put importance on the things that the coach does. I say throw with a purpose everyday. Start out every practice with stretching and throwing (every practice) but dont just throw. Throw with a purpose. What do I mean by that? Put the emphasis on proper throwing mechanics. Commit the time to let them do it the right way and have the time to do it properly. Understand that they will not develop their arm if they are not allowed to do so. Parents beware the AAU coach or Travel coach etc.. that is so intent on getting his team ready to win tournements that he is not teaching your kid the baseball lessons that will help him be a player down the road.
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