This is an excellent exercise for toning and strengthening the abdominals and core. It also tones the quadriceps, glutes and hamstrings.
To perform the exercise lie on your back with your head resting on the ground. Keeping your butt on the ground raise your legs straight up and out so they form a giant 'v' perpendicular to the floor. Keep your legs straight.
Rest your forearms just underneath your pectorals with one hand on top of the other to form a pyramid shape perpendicular to your stomach. To begin the movement, lift your hands (keeping them together) up through your legs, straightening out your arms. At the same time, roll your upper chest up off the ground in a crunch movement. Keep your lower back on the ground. At the end of the push through, your hands should be six to eight inches past your legs. Pause for a one count, return to the starting position and repeat.