I see more flat stomach and six-pack ab infomercials everyday that revolve around the classic crunch move.

We all know this move: lie on the floor on your back, grab the back of your head with your hands and pull it two inches off the floor. I think it’s safe to say this method does not work very well for building your 6-pack abs and flattening out your stomach.

[There's nothing intense about this exercise. Look at this poor girl's facial expression! Not another time wasting crunch, please...]

Aside from them being useless for getting six pack abs, the crunch movement itself is actually harmful to your spine and lower back. Every single time you perform a crunch, you are doing what the world’s leading experts on back pain describe as a dangerous motion.

Research shows every time you crunch, you do what is called spinal flexion, and spinal flexion compresses the disks between your vertebrae. If you do that too much, you could end up with a herniated disc. It’s the same motion as rounding your back to pick up something off the floor, and you probably know someone who has hurt their back that way!

Total body ab exercises are more effective.

Instead of wasting your life lying on your back doing an exercise that you can do hundreds of times, you need to replace crunches and all those other 1980s aerobics style exercises with better, total body ab exercises to get more results in less time.

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