How many calories you burn while swimming depends on your stroke, effort, speed, distance, duration, gender, weight and skill. Because most people swim a mix of strokes at various intensities, computing your exact calorie count is difficult. For example, a 150 pound athlete burns about 272 calories by swimming 1500 yards in 30 minutes; swimming butterfly for 30 minutes burns 38 percent more calories, breaststroke burns 25 percent more and backstroke 12 percent less. Compare that with a 120 pound athlete who burns only 218 calories swimming the same 1500 yard workout (60 lengths in a 25 yard pool).


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