- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does breath holding drills in a pool on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does breath holding drills in a pool on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does breathing exercises with teammates on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 31: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does breath holding drills in a pool on January 31, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, young fans look on as Padres pitchers and catchers do underwater training in San Diego on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove listened to instructions with teammates on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 31: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does breath holding drills in a pool on January 31, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 31: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove, pushes a brick, the length of a competition pool 13-feet deep on January 31, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove, left bottom, beats Padres teammates to the torpedo in an Underwater Torpedo game on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove lead a group of teammates in an underwater drill on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Prime Hall, left, and Tyrus Griffin of Deep End Fitness instruct Padres pitchers and catchers during a recent training session on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 25: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove takes a photo with local students after an underwater training session on January 25, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 31: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does a drill with other athletes where someone has to be touching a brick at the bottom of pool 13-feet deep on January 31, 2023. (K.C. Alfred / The San Diego Union-Tribune)
- The San Diego Union-TribuneSan Diego CA - January 31: During the offseason, San Diego Padres pitcher has been working out with Deep End Fitness, an underwater training program at local swimming pools run by former Marine Raiders. Here, Musgrove does weight exercises with 40-pound weights in the bottom of pool 13-feet deep on January 31, 2023. (K.C. Alfred / The San Diego Union-Tribune)

For the past few off-seasons, Padres pitcher Joe Musgrove has been working out with Deep End Fitness, an intense, yet calm workout regimen that includes on land and underwater breathing drills and workouts. Participants do breath work poolside before outlining ability goals and individual intentions, before hopping into a thirteen foot-deep pool. The underwater drills include calm, breath holding, to walking the length of the pool carrying 40-pound weights. Other times their are group drills.
Deep End Fitness was founded by a pair of former Marine Raiders. Musgrove has not been alone in his training. He has brought along fellow pitchers and even Fernando Tatis Jr. On a recent outing, a group of Padres pitchers and catchers ed in at a La Jolla pool as a small group of locals looked on.