Trunk Conditioning Capacity - 1
Lie faceup on the floor. Put your hands out to the side with your palms down. (Your body will form a T shape.) Raise your straight legs up to 90 degrees, pull your belly button toward the ground and tighten your low back against the ground. Lower your legs to one side. As they touch the ground, reverse direction and lower your legs to the other side. That’s 1 rep.
Prescription : 3 x 15 reps