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++ those same larger muscles will not normally tear but will pull on the smaller muscles/tendons creating the problem. ++
Precisely...
Which is part of the theory behind yoga (and Insanity, a variant on P90X), that it works the *stabilizer* and smaller muscles and tendons, so that they can support the ever-increasing power...
........
Just curious Jeff ... does your son (at age 18) do the "Recovery" disc much? For me, that's an age-appropriate take on P90X Yoga (since your son no doubt needs a bit less of a "rehab" idea than older folks).
90 MPH at 18. Is your son looking at college pitching, or getting a minors deal? :- ) Congrats!