Instructions:

1. Lie flat on your back with your legs straight and your arms extended overhead, holding the band.
2. Engage your abs and lift your legs and upper body off the ground simultaneously, reaching your hands towards your toes.
3. As you lower your legs and upper body back down, switch the position of your legs, crossing one over the other.
4. Repeat the movement, alternating the position of your legs with each repetition.
5. Continue for the desired number of repetitions.