To lose 10 pounds, a person of average weight needs to do jumping jacks at a moderate intensity for 100 hours or more. The amount of calories burned during exercise is entirely dependent on a person's weight and the intensity and duration of the workout, according to WebMD.
A person needs to burn 35,000 calories to lose 10 pounds. One pound is equal to 3,500 calories. A person doing jumping jacks at a moderate intensity burns an average of 5 or 6 calories per minute. Heavier people burn the same amount of calories in less time than lighter people because the excess weight causes the muscles to do more work.