As a Coach for the past 13 years and played for over 20, all of my coaches never preached curve balls till I was 16 or my body was fully developed to deal with the stressors of throwing that type of motion.
They focused on my 2 and 4 seam, including a good change up. If I was caught throwing a curve or slider, I was benched. They said in the long run you will thank us. Now, I'm almost 50 and my arm is till strong, I don't have arm issues and I pitch 2Ball to my 12U team live, I can still can heat it up.
The message I wanted to say is that we Coaches need to stop hurting our young players. Just focus on building their mechanics, listen to the children and if they hurt shut them down. Let the body heal and follow your family docs advice. We have to make the game fun again. The last time I looked, no one gets paid to play till A ball or earning a full ride...baseball is a lifestyle so let's teach our players to love it first, if not they will burn out their arms and their hearts too if it's based on winning only...Be safe our there...
Black Hills - Major Rockies
Cal Ripken - Lacey Baseball Club
Mobile - 253.737.0496