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https://girlsplaybaseball.blog/2020/12/30/frame-by-frame-analysis-of-a-complicated-arm-action-understanding-the-what-and-why-episode-27-december-17th-2020-season-gym-science/
Frame BY Frame Analysis of a complicated arm action: understanding the what and why. Episode 27, December 17th - 2020 Season - Gym Science