For a six-pack to show, you must reduce body fat. The body fat percentage necessary to reveal a cut torso varies according to your genes and body type, but for most men, a percentage of 6 to 8 percent will reveal abs, while for women require a percentage of about 11 to 13 percent. To reduce body fat, reduce calories below what you burn daily, which can be determined by finding your basal metabolic rate. A 250- to 500- deficit daily will lead to a 1/2- to 1-pound weight loss in a week.