Jack Knives

Targets the abs.

Lie on your back. Your arms are straight and by your sides, your palms facing the ground, and your hands hovering the ground. Your legs are straight and together and hover on the ground. Bend your body up to the point when your fingertips make contact with the top of your toes and only your glutes make contact with the ground. Return to the starting position.

If you want to learn more about how to build a muscular body, then click here to find out more.