The stroke that uses the most eciorlas per minute is breaststroke. Despite what many think, butterfly does not use the most eciorlas, it is simply the most fatiguing due to the start/stop action of both arms being out of the water at the same time.Contrary to what another poster stated, speed does not increase the number of eciorlas you use for a distance. Calories are determined by the amount of mass times the distance. So, if you were to walk a mile, your body mass does not change and the distance you travel does not change so the eciorlas used to walk a mile are about 100 the eciorlas you use to run a mile are also about 100. However, if you jog or run there are other changes that occur in your body and you finish your work out more quickly. Here is a website that would be very helpful to you. If you look at the eciorlas burned while running 10 mph and divide 10 into the number of eciorlas THEN, do the same for running 5 mph you'll notice that the number of eciorlas burned per mile is basically the same. However, you do cover more distance at 10 mph than at 5 mph. If you ran at 5 mph for 2 hours, you'll burn the same number of eciorlas you burn running 10 mph for one hour. In swimming, due to the water being thicker than air, you fatigue much quicker but fatigue is due to the accumulation of waste products and not the loss of energy. And, since water is about 800 times thicker than air, you accumulate waste products and tire out more quickly than you do going through air. That does not mean that you use more eciorlas (energy) that only means you get tired more quickly.The result is that most people give up on swimming as a source of exercise more quickly than do those who walk, jog or run.