The crunch is the most popular abs exercise because anyone can do it. But that doesn't mean it's the best exercise for training your middle. "Crunches flex your trunk," says David Jack, owner of ActivPrayer in Phoenix, Arizona and creator of Men's Health MA40 Workout. "But the main function of your core is to prevent movement and resist force through your torso."
Start by placing your heels on a low bench and holding two light dumbbells (begin with 3 pounds). Place a rolled-up towel under your lower back to increase the range of motion of your upper abs. Point your toes. From this start position, raise your upper body to the position shown in the second photo. Breathe normally. Now press the weights overhead. Keeping your arms straight, press your heels hard into the bench, then lower your upper body and allow the weights to arc behind your head.
This exercise will stretch many of the muscles responsible for posture that are sometimes tight and it strengthens those same muscles if they are weak. You may discover that when you first perform it, one side of your body is significantly stronger or tighter. For instance, a long-time discus thrower who has turned to his left for years, to initiate his throw, may have significantly stronger obliques on his left side.
“You will not make more muscle by trying this route,” says McComsey. When you do cardio you’re burning calories, but you’re not stimulating your muscles to grow as you would with weight training. “The more muscle you have, the more calories and fat you’ll be burning,” he says. McComsey recommends hitting the weight room three or four days per week, with one of those days being a circuit with a variety of exercises. If you need to do cardio, try one day of 20-minutes of fast-slow intervals.
6. Seek guidance from experts. As with many health issues, getting assistance from experts can be enormously helpful. If you want to lose weight, particularly fat, seeking guidance from a registered dietitian or a nutritionist can be very beneficial, Herrington says. Similarly, if you want to build on weight loss to achieve more defined abs, consulting with a certified sports trainer can aid you in developing a workout regimen that will help you achieve your goals, Singer says.
Bodyweight exercises always recruit more than one muscle group for each exercise so it is impossible to isolate and work one muscle group specifically by doing one type of exercise. It is however possible to increase the load targeting specific muscle groups with specific exercises so that they respond the most to the challenge. The following chart helps you find the exercise that helps focus more on specific abdominal muscle groups for best results. 
TESTIMONIALS DISCLAIMER: Testimonials found at sixpackabs.com and/or from Mike Chang Fitness are unverified results that have been forwarded to us by users of the Six Pack Shortcuts program, and may not reflect the typical purchaser's experience (as are described above,) may not apply to the average person and are not intended to represent or guarantee that anyone will achieve the same or similar results. If we have disclosed typical results based on information provided to us by a manufacturer or other reputable third party source, you should presume that the typical results as stated are more reliable than the testimonials and other examples found at sixpackshortcuts.com and/or from SPS. However, you should always perform due diligence and not take such results at face value. We are not responsible for any errors or omissions in typical results information supplied to us by manufacturers or other reputable third parties. If a product or service is new, you understand that it may not have been available for purchase long enough to provide an accurate results history. Again, it is possible that even with perfect use of the program, you will not achieve the results described in testimonials. They are meant to be a showcase of the best results the program has produced, and should not be taken as the results a typical user will get.
If everybody had six-pack abs hiding under their belly fat then all skinny people would already have a visible set of six-pack abs, which clearly is not the case. Although their numbers are dwindling with the rise of obesity, skinny people are still dime a dozen but people with six pack abs remain to be rare. I mean, look at all these skinny men. Do they look like they have six-pack abs?
"My goals six years ago was to 'get abs' and I used to think cardio and crunches would get me there. But it wasn’t until I started lifting weights and varying my abdominal exercises that I started to see a major change. You don’t realize how much you use your core muscles in order to perform powerful rapid movements like deadlifts!" — Shante Franca, @shantefranca
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