Are we able to predict arm injuries before they occur? Turns out, we might be able to. A 5-year MLB Study concluded that Preseason weakness of External Rotation and Supraspinatus strength is a predictor of in-season throwing-related injury.
“30% of coaches, 51% of players, and 37% of parents believe Tommy John surgery should be performed in the absence of elbow injury to enhance performance” (Ahmad, et al.)
But you can actually get all the same gains faster by doing this instead.