I also bought the Miracle Ball set on the spot at Costco. I have various pains that I've gone thru PT for with little relief; may have fibromyalgia. I don't take any pills; looking for natural pain relief. After 1 time on the balls, my low back pain was gone for a long while. I couldn't believe it! I did get a headache though, almost immediately upon placing the ball under my neck. Any suggestions or reasons why? Thank you so much for taking the time to develop this terrific program! I will keep w/ the program & expect more good results. Blessings!