Lying flat on your back with both feet off the ground, knees at 90 degrees and arms straight up to the ceiling; push your lower back into the ground as you lower your leg/s and/or arm/s towards the ground. The exact combination of limbs moved is dictated by your ability to keep your lower back flat to the floor whilst performing the movement.<br/><br/>Sets + Reps: 2 x 5-20/side @ 3331