how many calories am i really burning on the treadmill?
Walking at 3.5 mph burns 120 calories in 30 minutes (80 calories in 20 minutes) Running at 5 mph burns 240 calories in 30 minutes (160 calories in 20 minutes) Running at 6 mph burns 300 calories in 30 minutes (200 calories in 20 minutes) Running at 7.5 mph burns 375 calories in 30 minutes (250 calories in 20 minutes)