Adam, co-founder of FlexPro Grip, discusses how over 40 high school and college pitchers increase their fastball spin to velocity ratio (Bauer Units) with FlexPro Grip Training in 8 weeks of training. This resulted in about 2 inches of additional movement. The study focused solely on fastballs and fastball variants (4 Seam, 2 Seam / Sinker, and Cutter).
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