Muscle Group: Abdominals
Lie back down on the ground, your legs across a bench in front of you.
Place your hands behind your neck and curl your body up toward your knees, arching your back. During this movement, turn your torso so that your right elbow comes across toward your left knee. Now lower your torso back to the ground.
Repeat, this time turning in the opposite direction, bringing your left elbow toward your right knee. Continue this pattern till you are done with your set.