I recommend using an ice pack under a wet towel, with both frozen ice balls and cold gel, which can help relieve lower back pain. Exercise, including stretching, strengthening the abdominal muscles, and stepping in different directions, and even swimming, can be very helpful. I occasionally use a chiropractic technique of adjusting the hips to relieve lower back pain. Also, a scenar device, an electrical pulsation device, properly used, can be helpful.