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An easy swim burns around 500 calories an hour, while a vigorous effort can reach up to 700 calories an hour. Swimming exercise provided workout for lower body, upper body, core, and back will all be worked and strengthen during a good swimming workout, you can go for 4 to 6 days swimming workout.
Quick Answer. While calories burned during swimming vary due to the intensity of exercise and weight of the swimmer, the average calories the sport requires per hour is between 423 and 632, according to Mayo Clinic. To lose a pound of fat, an individual must burn 3,500 more calories than he consumes. Continue Reading.