This move is a spin on the the double leg lower and will fire up your abdominals.
Lay on your back, and put your legs in the air like you're going to do a double leg lower. Then, plot twist (literally): "Twist one leg over the other really trying to squeeze them together as if you were trying to squeeze a piece of paper between your shins," Garzo explained.
"Put your arms out to a "T," then slowly lower your legs to the lowest point you can while keeping your spine neutral. (If you're not sure, just lower the the lowest point you can feel it in your abs. Feeling it in your lower back is not good!)"