Exercise Calorie Burn

Hill running and flat-out sprinting burn the most calories per hour but cannot realistically be sustained for a full hour. Hill running typically allows only 15–20 seconds of effort before requiring a break. The raw number of calories burn…

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Hill running and flat-out sprinting burn the most calories per hour but cannot realistically be sustained for a full hour. Hill running typically allows only 15–20 seconds of effort before requiring a break. The raw number of calories burned during exercise misses the central question of what type of calories are being burned. The body draws on three fuel sources during exercise: carbohydrates (glycogen/sugar), fat, and protein (muscle), in that priority order.