Build muscle strength and flexibility.Abdominal and back muscle exercises (core-strengthening exercises) help condition these muscles so that they work together like a natural corset for your back. Flexibility in your hips and upper legs aligns your pelvic bones to improve how your back feels. Your doctor or physical therapist can tell which exercises are right for you. Maintain a healthy weight. Being overweight strains back muscles. If you're overweight, trimming down can prevent back pain.