Quote Originally Posted by mrdevious
If you want to get some kick-ass core muscles on your stomach, the muscles under the 6 pack, I do a really good excercise that has given me great results and a flat stomach. It seems all the 6-pack developement in the world doesn't do much for actually flattening it.
Anywhoo, just lay on your back and put your legs together. Hover them a couple inches above the ground, and lift them way up, then way down, never touching the ground. This will probably kill your muscles if it's your first time, so you might want to start out lifting one leg at a time. Believe me, the first time I did this I went gung-ho and the next morning I couldn't sit up from bed lol.
Hell yeah, leg lifts are killer. I remember doing them in football practice a few years back, and you know how that goes...they punish you, and if they see you give up...you're running or whatever. But, yeah...those are absolutely great for the pack.

We also used to do this: When hovering, open your legs to make a V shape, hold that for a while, then bring it back in. Painful but effective.