I am a massage therapist and am on my feet all day at work. As a result, I often had at least some low back pain. I even tried changing my mattress, with limited results. A while ago, I started hearing from people who purchased Shape-Ups and shoes similar to them. They commented on how much their backs had improved, so I decided to give them a try. Initially, I used other brands of rocker-sole shoes, but some of them seemed to disintegrate after just a few months and others only had athletic styles. I purchased these because they have the Mary Jane style along with the rocker soles. Even being accustomed to this type of sole didn't save me from having to adjust a bit to them, my legs were somewhat sore for a week, but after that I've had no problem with them. Their styling is fun and they keep my lower back happy, plus my feet still feel good at the end of the work day. I can't speak for the fitness benefits of the shoe, as I'm sure there's a law of diminishing returns in regards to any method besides actual exercise, but I wear them while working out as well. These are a great buy, definitely worth the money.