If you want a simple low-tech test (and this isn't as accurate as what the electronic versions will give you), try this simple exercise: Sit in a chair with your knees bent and your feet flat on the floor. Using your thumb and index finger, gently pinch the skin on top of your right thigh. Measure the thickness of the pinched skin with a ruler. If it's 3.4 inch or less, you have about 14 percent body fat-ideal for a guy, quite fit for a woman. It it's 1 inch, you're probably closer to 18 percent fat, which is a tad high for a man but desirable for a woman. If you pinch more than an inch, you could be at increased risk for diabetes and heart disease.

This last measurement can be the most significant because it'll really help give you a sense of how well you're sticking to a plan. As you see your body fat percentage decrease, you'll see an increase in the amount of visible muscle. Experts say that in order for your abs to show, your body fat needs to be between 8 and 12 percent. For the average slightly overweight man, that means cutting body fat by about half.