TPM posted:Maybe what he has explained is that he isnt flexible enough and has to do the excercises properly to get the flexibility he needs to engage the process successfully.
If one isnt flexible enough, you won't be able to produce the velocity needed.
Just adding to TPM
Mobility is the word I would use and functional strength to go along with the movement. I too am a fan of Cressey & Reinhold and recently found Nunzio Signore via ABCA podcast (former Cressey Intern). IMO, a good trainer that focuses on strength and movement is what you're looking for. A good understanding of baseball and the athleticism needed to play the sport is a must.
Most youth pitchers/players have muscular imbalances that also impede their ability to move efficiently. GIRD is just another example of ROM in the arm, how it can be measured and trained for performance and safety of the athlete.