Leg lifts work the lower abdominals. To do this exercise correctly, place your hands under your buttocks forming a “cradle” for your body in order to reduce the strain on your lower back. Your legs should be slightly bent and not locked out straight and held 6 inches above the ground. Use your lower abs to lift your legs up to about 25 – 30 inches off the ground.
how long for each rep
you want to raise yoour legs to 30in mark then slowly bring them back down to the 6in mark then up again