Yoenis Cespedes Wows the Mets Underhand, Overhand and Many Other Ways - The New York Times
Underhand and backhand flips to second base :
Misconception of 'natural motion' of softball underhand fastpitch
Pitch (baseball) - Wikipedia
Is it against the rules to pitch underhand in baseball? - Quora
Tips for an underhand toss :
Nick Pratto's underhanded throw | 09/04/2022 | MLB.com
In Japan, Fear That Submarine Starters Will Fall by the Wayside - The New York Times
Why are fast-pitch softball players able to pitch longer than baseball players without hurting their shoulders or elbows despite throwing just as hard underhand as overhand? - Quora
Softball vs Baseball Pitching Speed Chart - TopVelocity
Submarine (baseball) - Wikipedia
Underhand pitchers under spotlight again three decades after golden days - The Korea Times
Is it more strain on your shoulder to pitch underhand or overhand? - Quora
What is a Submarine Pitcher in Baseball? Does the MLB Currently Have One? - EssentiallySports
Regular Season Pitching Rules - Little League
Nick Maldonado: A look at the Vanderbilt baseball right-handed pitcher
Are fast-pitch softball pitchers overdoing it? – Washington University School of Medicine in St. Louis
Pitching variance in baseball and softball – Golden Gate Xpress
MLB Submarine Pitchers (HD) - YouTube
In baseball, could the pitcher deliver the ball underhand, like in softball? - Quora
Tips for an underhand toss :
Pitching's Outsiders: 'No One Wants to Play Catch With Us' - The New York Times
