Yeah man, I would have to say from my quest that the lower two are the hardest to see. It depends on your body type but generally that area around your belly button is the hardest. You just have to really watch what you eat (low fat is important), do lots of low intensity (120 to 160 heart rate) cardio because that burns fat (stored energy) rather than what’s in your stomach (immediate energy) and lower abs work (leg raises off a bench or hanging from a chin-up bar) 3 to 4 times a week. You’ll know you are working the muscles if they hurt the next day – you gotta make’em burn. If you do these things and you are like me you’ll see the top ones first and then slowly the bottom ones will start to show but it takes time so you’ll need a little determination. Someone once told me ‘the last place you take fat off your body is the first place you put it on and vice versa.’ This saying might help you determine if you’ll have better luck with the bottom two than I have.