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www.reference.com/article/many-calories-burn-cycling-12bb157fc61c073b

According to WebMD, someone who weighs 150 pounds will burn 273 calories by riding a bike at a leisurely pace for an hour. The exact amount of calories burned by cycling depends on the intensity of the ride, how long the ride lasts and how much the cyclist weighs.

www.reference.com/article/many-calories-interval-cycling-burn-207688b136f21204

Biking to Live explains that if a 250-pound cyclist adds 3x8 intervals at a speed of 16 to 19 mph, an hour routine would burn 1091 calories. Interval cycling in this instance helps the cyclist burn an extra 182 calories when compared to regular cycling.

www.reference.com/article/many-calories-burned-day-a16d4e4820524993

The amount of calories a person burns naturally in a day depends on factors such as gender, height, current weight and age, according to SFGate. The process of naturally burning calories without added activity is called basal metabolic rate, or BMR.

www.reference.com/article/many-calories-running-burn-8400642d493556fc

The formula to determine the total number of calories burned by mile is 0.75 times the runner's weight in pounds, so a 150-pound runner would typically burn 112.5 calories per mile. The speed at which the runner runs is also a factor.

www.reference.com/article/many-calories-person-burn-day-a832e3593e2cb2c8

Mayo Clinic states the number of calories a person burns in a day varies based on her basal metabolic rate and that person's individual level of physical activity. The BMR is the number of calories the body utilizes to perform basic human functions such as breathing.

www.reference.com/article/many-calories-walking-burn-fcb385d9a6030d79

The number of calories burned while walking depends on the weight of the person and the distance traversed. According to About.com's medical review board, the average energy expenditure per mile of walking is 100 calories per mile for a 180-pound person and 65 calories ...

www.reference.com/article/many-calories-burned-doing-nothing-60b3f132c12cbdae

The amount of calories needed to keep a body functioning varies widely from person to person. According to Fitness Blender, a 5-foot-tall, 35 year-old-woman weighing 130 pounds needs 1,338 calories, while a 20-year-old, 6-foot-tall man weighing 180 pounds needs 1,966.