Found this so interesting when I read it. I immediately tried it on my two kids. 13 Yr. old (non-CAH) daughter said it was great and relaxing, wanted a total foot massage after that! :) 9 yr. old SWCAH son happens to be EXTREMELY ticklish, so needless to say I had a little difficulty. But he didn't feel it was tender of sore feeling. But because he is so ticklish, maybe the "test" wasn't really accurate. However, I have scoliosis (has your wife had surgery? I had 3 curves) and can't wait to try this the next time my back is bothering me. I will let you know. Also, believe it or not, my son does not crave salt - never has.