 [ Symptoms ] i started having severe pain in my lower back and left side abdomen just under my bottom rib should my doctor do other tests [ Disease ] most gym equipment overestimates the caloric burn by up to 15 that is because treadmills stationary bikes and elliptical do not take into consideration a person is gender body composition muscle fat level of training age and whether or not someone is holding onto the handles of the machine which reduces the number of calories burned