Baseball pitching motion expert Angel Borrelli and coach Joe Janish discuss multiple injuries occurring during MLB 2015 spring training. Among the topics include New York Mets pitcher Josh Edgin, who was diagnosed with a "stretched ligament" in his elbow, and was described as having "dead arm." Also, they discuss Philadelphia Phillies pitcher Cliff Lee's decision to pitch through a torn flexor. They also follow up on Episode 3 subjects Yu Darvish, who is undergoing Tommy John surgery, and Gavin Floyd, who has re-fractured his olecranon. Joe and Angel also re-visit the velocity-robbing flaw of "sinking," comparing to "drop-and-drive," providing information that may be surprising to fans of Tom Seaver. On a positive note, they highlight Washington Nationals pitcher Matt Thornton, who is still throwing 95+ MPH at the age of 38 -- how does he maintain that velocity at that age? Additionally, a shout-out of congratulations to College Park High School senior Joe DeMers, who pitched a perfect game against powerhouse Monte Vista. Finally, Angel provides a secret to pitching velocity -- one that helped DeMers pitch his perfecto.