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abdomen alternating legs Fig arms back Fig back is healthy back pain back to sag backache bend your knees body buttocks cartilage cushion cartilage disk cause condition of swayback curved doctor exer Exercise 11 Exercise 13 exercise program FIGURE 33 flex the hips flex your knees floor help your back high pillow Incorrect Correct Correct Incorrect Correct FIGURE Incorrect Incorrect Correct increases swayback injury or strain Keep your knee knee as close Lie flat lower back Lower your head matter how strong moist heat moist towel muscle spasms muscles that support neck object pelvis posi posture relax relieves swayback Repeat rest your back sag forward serious injury simple massage sleeping habits slouching slowly lower spinal column stool Stoop kyphosis straighten strain or injury strain your back straining the back stretch sturdy chair swayback Fig Swayback lordosis tend to bulge tired twist your back upper back vertebrae tend X-ray picture