It is usually recommended to swim only after 30 minutes after a meal, there are many reasons why you can’t swim immediately after a meal: 1. The most important reason is that immediately after a meal, swimming, blood distribution in the gastrointestinal tract and can not fully engorge the skeletal muscles, skeletal muscles can not fully start and warm up easily cause hand and foot convulsions to take hold, easy to drown in swimming and other situations, so it is recommended that after 30 minutes after a meal, when the blood runs in the gastrointestinal tract 2. 30 minutes after a meal, swimming can make the body’s basal metabolic rate reach a more stable state, and swimming will help the body consume excess calories, which is beneficial to weight loss and fat loss. 3. 30 minutes after a meal, blood sugar can rise to a higher level, swimming will not cause sudden hypoglycemic reaction and hypoglycemic coma, which is beneficial to the body. It is beneficial to the body.