I had such severe back problems I couldn't walk for 14 months, offered surgery with a 70% chance the ptoblem would retun. i heard an aquaintance mention these and how it helped, so I bought one. Between this and taking turmeric supplements I bdon' have problem anymore. The heat was great, more than great. i went from severly hobbling around to doing sit ups hang up side down in 30 days. Start slow and stick with it, and in the beginning be satisfied even being horizontal to the floor, little by little you will be able to go all the way