The way to continuous results is through diversity in your workout. Add this ab exercise into your routine to work the lower and upper abs. If you want that six pack to show you have to have a good ab routine as well as a very “clean” diet.
Start this exercise by lying flat on your back on a mat. Lift your legs straight up to the ceiling, as far as they can go without having to bend them. Arms should be straight at your sides.
Exhale and pull your head forward from the mat keeping your arms straight and at the sides of your legs. Push forward with your fingers and release a few inches, and then push forward repetitively.
Return to start position after 10-12 reps.