 Because even though the lower back is taking stress and that's where we're feeling pain, the movement dysfunction could be anywhere in the body. It could be in the foot and the ankle. It could be in the hand and the wrist. If your arm isn't moving like it's supposed to to reach into that overhead cabinet, you're going to tilt and side bend your trunk to get your arm up there. You do that for five or six years, you're going to start having back pain. So lower back can...