Does training with lighter or heavier than regulation balls improve performance? What adaptations to coordination patterns do they encourage? Do they increase the chance of injury?

Articles:Weighted-Ball Velocity Enhancement Programs for Baseball PitchersEffect of a 6-Week Weighted Baseball Throwing Program on Pitch Velocity, Pitching Arm Biomechanics, Passive Range of Motion, and Injury Rates

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403 – Manipulating Ball Weight as a Constraint in Practice