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Actually, sprint intervals burn no more fat than jogging. Actually, sprints burn carbohydrates more than fat, while jogging burns more fat than carbohydrates. In the long run it makes no difference however as fat will be lost depending of what deficit there is in caloric intake. Aerobic exercise is what boost your overall heart and lung fitness. Jogging is aeorbic exercise. Sprints are anaerobic. Treadmills typically have their speeds in MPH. 11 should be 11mph if it is a commercial treadmill. That would be a fast sprint speed. My thoughts are as long as one is active, that is a good thing mentally and physically.
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