1. Lay on your back on a soft workout surface while holding a barbell directly above your chest in a locked-arm position, and your legs outstretched on the floor (no siestas!)
2. Contract your lower abdominal muscles to bring your legs up and off the ground by about 3 inches, this is the starting position
3. As you exhale, elevate your legs (keeping them straight) to one side, coming close to (or even touching) one side of the barbell, before lowering them back down to the centre and then up to the opposing side to and then back down to the centre to complete one rep
The primary muscles used in Barbell Windshield Wipers are the Abs and Shoulders.