i have a six pack with good obliques, mountain climbers and bicycles, do daily morning midday and afternoon. throw in other workouts with it like running and swimming. if your skinny use weigh gain and protein shakes if your fat just push yourself
Yeah, you could have the most amazing abs ever, and it won't matter if your body fat % is too high for them to be visible. I've heard good things about the P90X Lean program, if you have the $ to get it.