introducing the perfect situp. invented by the u.s. navy seal who brought you the perfect pushup, the perfect situp re-invents the situp by combining the upper ab crunch with the lower ab leg lift. then the perfect situp adds an audible coach. you'll hear a click when you've done the exercise correctly. you hear it and you'll feel it. it's this one-two punch that gets you better faster results. traditional situps and crunches are hard to do, and only effectively work half your abs -- the upper half. but the perfect situp targets and tones the upper abs and the lower abs. the secret is the combination of perfect position and resistance. with the addition of the patent pending perfect situp leg blades you'll activate all your abs. the inner obliques, the outer obliques, the upper abs, and the hard to reach deep lower abs. in fact, a university study shows the perfect situp double crunch delivers a significantly more effective abdominal contraction than a regular crunch.