A review in JAMA Internal Medicine found that current evidence supports exercise in combination with education may be effective for preventing future occurrences of low back pain. According to one author on the review, "Exercise combined with education reduced the risk of an episode of low back pain in the next year by 45 percent. In other words, it almost halved the risk." The type of exercise, whether focused on strengthening the core and back muscles or a combination of aerobic conditioning and strength training, does not make a difference. The review found that back belts and shoe insoles were not helpful for preventing future low back pain.