Having a strong core can help you reduce lower back pain. Try this chair crunch to increase abdominal strength. Lying on your back with your lower legs resting comfortably on a chair, place your fingers gently behind you head and lift your chin to the ceiling. Tighten your abdominal muscles and use these muscles to slowly elevate your shoulders off of the floor – this will cause your stomach to crunch together and you core muscles to contract. Slowly lower back to starting position. Repeat a series of 10, three times, adding more as your core gets stronger.