The rate at which body fat is converted to energy varies from person to person. Energy expenditure depends on the size and body composition of the individual as well as the intensity and duration of activity.
Thirty-five hundred calories is the equivalent of roughly one pound. Different exercises burn different amounts of calories. Jumping rope and running at the speed of eight miles per hour burn 861 to 1286 calories per hour for a 160 to 240 pound person. Stationary rowing burns 438 to 654 calories per hour for a 160 to 240 pound person. The higher the intensity of the workout and the heavier the individual performing the workout, the more calories stored as fat will be converted to energy and burned.