Swimming immediately after eating is perfectly safe despite what Mom used to say. Wait a half hour after eating before you can safely go swimming. The myth involves the possibility of suffering severe muscle cramping and drowning from swimming on a full stomach. While it’s true that the digestive process does divert the circulation of the blood toward the gut and to a certain extent, away from the muscles, the fact is that an episode of drowning caused by swimming on a full stomach has never been documented. Neither the American Academy of Pediatrics nor the American Red Cross makes any specific recommendations about waiting any amount of time after eating before taking a swim. There’s a theoretical possibility that one could develop a cramp while swimming with a full stomach, but a person swimming in a pool or controlled swimming area could easily exit the water if this happens. As with any exercise after eating, swimming right after a big meal might be uncomfortable, but it won’t cause you to drown.
Because water is about 800 times denser than air, you can work harder, and burn more calories, in a pool than out of it
Female swimmers have been shown to experience significantly less tension, depression and anger after exercising than before.