Ok, I've got a nasty sciatica injury. This stupid-looking thing is a life saver tho! It takes some time to get used to using it properly, but WOW! I put it on my bed and I lay on top of this contraption, kinda in-between my groin and hip... it hurts because it's working. It targets the muscles under the muscle... but "sweet relief" when you find that magic spot!! This stupid thing has saved my sanity!