Lie on your back, with your legs and arms extended a few inches above the floor. Press your lower back into the floor to engage your abs. This is the starting position.
In one movement, lift your arms, shoulders, and legs off the floor, reaching your hands toward your feet with straight legs, creating a "V" shape with your body. If this is too difficult, slightly bend the knees.
Lower your arms and legs back down to the starting position.