Despite being very strong and having a great frame, Brennan had low to moderate power numbers during his college years and first two years in professional baseball, never hitting more than 10 home runs in a season. In the fall of 2008, Shortly after his second full season in professional baseball, Brennan discovered P3.
During Brennan’s initial evaluation it was clear that he had trouble with Relaxation and Tempo in all movements (limits power and efficient kinematics), as well poor thoracic extension and shoulder stability (postural issues led to back pain and mechanical flaws). He also could not separate vertical and horizontal forces in rotation (changing levels during rotation makes it difficult for hitters to make consistent contact and get proper flight and trajectory on the ball).
Shown above is Force Plate Data as Brennan Boesch, makes a lateral plyometric movement. The Red lines represents horizontal force and the Blue lines represents vertical force. Small lines are Pre Off-Season Training; Solid lines are Post Off-Season Training.
Not only did the quantity of force greatly increase (20%) during training, but Brennan also changed the way he produces this maximal force, which enables Brennan to reach Peak Force 30% faster. Brennan was also able to separate horizontal and vertical forces forces more efficiently which correlates with being able to stay in the correct plane when rotating or hitting.