What happens next in this paragraph?

How to treat sciatica with exercise
Try the plank exercise.
Many health professionals will recommend core strengthening exercises like the plank to help alleviate pain. Stronger core muscles help to support and relieve your back.
Pick your answer from:
I. They protect your back for long periods of time and improve your range of motion, avoiding injury. Lie on your back with your spine straight and your feet on the floor, with your upper torso turned forward.
II. You can do the plank pose on your back or on your side. Start in the plank pose on your back.
III. They also help keep your pelvis in a neutral alignment, decreasing compression of the nerves. Lie face-down on a soft surface, such as an exercise mat.
IV. One good example of a plank exercise is the plank barbell. Grab the barbell and bring it close to your torso, knees and stomach, and lower the barbell onto your knee.
III.