Teeter Hang Ups have research and testing to back them up. Roger Teeter has been continually developing and refining the product since 1981, and the results are unparalleled, according to data found on the TeeterTV .com website. The Teeter Hang Ups seem to be easy to use, and in addition to relieving back pain, they have been shown to improve joint health, build and tone muscle, and increase flexibility. Someone as skeptical as I am can even try one out for a money-back 30-day in-home trial, just by visiting TeeterTV .com.
After injuring my back in football as a teenager, I wish one of these were available in the High School gym!