The forearm muscle that aids in supination.
This muscle is a deep muscle that resides between the bones the superficial muscles, particularly obscured from view by the wrist and finger extensor muscles.
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- Pitch Movement, Part III: The River of Seams
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- Pitch Movement, Part II: Sweet Seams (Are Made of This)
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- Pitch Movement, Part I: You Spin Me Round (Like a Baseball)
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- Scouting Grades: Speed
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