I have tried using the big exercise balls, before, and, love them. I left mine in Texas with a friend. I need to get another one, is the swiss ball the same thing? Just a big inflatable ball? I do put my hands behind my head sometimes, and, that eleviates a little of the stress, but, I think I'm still doing something wrong. Hmmmm....I know I've been wanting to get a personal trainer at some point, but, that requires money.