My lower back would hurt from constant sitting and then I tried this and my pain just went away in 2 days. When I use it, I hang for 10 minutes in 5 min increments and level off each time before stepping off. Make sure you watch the DVD it come with. This machine really works and I never will live without one again. I feel my lower back "pop" when it needs too and that means that the discs are seperating from each other to let fluid through again. The pain is then gone if I had any. I swear by this machine and told all my family about it and now they even bought one for use. This machine pulls apart your spinal coard just like the day you were born to give you an almost brand new back. This is why people have been hanging from trees for centuries!!!