Answer Happy

Muscles that act as primary mover
Muscles that act as secondary movers
Muscles that fire during cocking phase (when you externallyrotate your shoulder and move the ball back)
deltoid muscle
Rotator cuff
Muscles that fire during the acceleration phase (as youinternally rotate your shoulder and move the ball towards yourtarget)
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Muscles that fire during the follow through (after you releasethe ball and complete the throwing motion)
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In any phase did you feel a difference between muscles thatperformed concentric contractions versus eccentriccontractions.
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