#1 of the images Why do professional baseball players learn from “amateurs”? Who are these “proouts” who are suddenly attracting so much attention? | FRIDAY DIGITAL

Softbank’s Takuya Kai, who has adopted framing since the 2023 season under the guidance of Proout (PHOTO: AFLO)

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Why do professional baseball players learn from “amateurs”? Who are these “proouts” who are suddenly attracting so much attention?

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