Sitting on the floor or exercise mat, lean back in to a V-sit position to engage your core. Place your hands at your side for balance or cross over your chest for more of a challenge.
Extend your legs fully with a slight bend in your knees.
Lift your heels about six inches off the floor. Inhale and make small, rapid up and down scissor-like motions with your legs. The key is to focus on having your midsection do the work and to keep your abs constantly contracted throughout the exercise.
Complete the recommended number of repetitions and then exhale as you lower your legs back down to the mat to the starting position.