The Softball Pitching Plane (SPP): A Reliable Geometric Descriptor of Arm Trajectory and Its Relationship to Ball Velocity in Adolescent Pitchers. - Cheng, Kai-Jen; Jump, Ian P.; Zappa, Ryan M.; Fava, Anthony W.; Klubertanz, Madeline R.; Caplan, Joseph H.; Oliver, Gretchen D. (Applied Sciences (2076-3417), 2026)