I'm going to a fitness class and when we're working on our lower abs (bottom part of the jelly belly) we lift our legs up into the table top position.
The part of your leg from your hip to knee is at a 90 degree angle to the floor then the lower half of ur leg is at 90 degrees to that so if that makes sense???
Anyway u need to make sure ur back isn't totally flat to the floor and definitely not arched too much either. just enough space to fit ur hand in.
Then you do the belly button thing, its a pilates principle i think. U contract ur core (your lower ab muscles) It's like trying to puul ur belly button in as much as you can, but DON'T hold ur breath.
U can do sit ups in that position, or else try to lift ur bum up, all the time keeping the tension/belly button in. If ur lifting ur bum up u need to really control it. Its a tiny movement but you need to make sure ur not just dropping it afterwards. U use those muscles to do it.
Then you could drop alternate legs towards the floor, keeping the 90 degree angle at the knee making usre the movement is at your hip joint. all the time the most important thing is to keep ur core engaged - keep belly button in and really try to do slow controlled movements.
Hope that makes some bit of sense
