Can a Baltimore fan (and ballerina) ask a question?

[ProfessorGAC]

8. Some Already Answered

But, a couple more things.
Athletes are more tuned than ever. The fast twitch muscles get to a point where they can apply more force than ligaments & joints can take for long.
Then, they're so reliant on that explosion that they are less effective until they are at least 90% healed.
On the pitching thing, that's been correctly answered already, but pitchers from 12 years old forward, are being taught yo put more & more spin on the ball. That stresses ligaments & tendons especially as they pursue more & more velocity. Also, higher spin requires more grip forces which tightens all the muscles in the forearm, leading to more elbow issues.