What do you mean by pain-free?
At the risk of oversimplifying things, Primal 7 helps with a wide variety of conditions because it alleviates some of the force of gravity. Less gravity means less pain because you're not having to put the full weight of your body on the parts that hurt. Less pain means you can actually do the exercises you want to do and start to strengthen your body. Ultimately, movement encourages circulation and circulation in turn encourages healing.