Anatomy and bio-mechanics may seem like too heady a subject for most instructors and their student athletes. The terms are obscure, the explanations obtuse, and very much in one ear, out the other.

It often remains that way until pain or injury provides a wake-up call. Well, before you need it, here's that call. It has to do with why elbows are so injury-prone and why both the cause and the solution come down to which way your arm turns when you throw the pitch.

For those not willing to understand the full story, at least remember this: pronation is good, supination is bad. Turn your hand over the ball on release, don't turn it under.

Paid Team Player members have access to the illustrations and explanation of terms like supination, olecranon, and more. Most importantly they will understand the science that puts elbows at risk from "elbow banging". Please login or join.