Abstract
This study examines the effects of training using the throwing practice gear FLECHA on throwing performance for a university baseball player who experienced the yips during high school. The training involved performing 20 throws of FLECHA per day, at least 4 times a week, over a period of 3 months. In order to maximize the training effects, the use of regulation balls for throwing was prohibited throughout the 3-month training period. As a result of the training, improvements in the trajectory of the throwing arm, the acquisition of “flexing” movements involving the trunk and upper body, and the resolution of “bending” movements in the stepping leg led to significant improvements in both ball speed (from an average of 98.2 ± 3.0 km/h before training to 119.2± 2.2 km/h after training) and ball spin rate (from an average of 1216.8 ± 80.3 rpm before training to 1484.2 ± 93.6 rpm after training). On the other hand, accuracy decreased temporarily after 3 months of non-throwing balls, but returned to normal soon after returning to normal activities. These results suggest that that the training using FLECHA may improve the throwing performance of college baseball players who experienced the yips in high school.
https://ror.org/04n6qtb21 
