When we would go down the shore as kids, they had these vibrating foot massagers and seats that were just rapidly shaking metal plates that often left you rubbery-legged. I remember getting off one and my Grandmother telling me that they used to have equipment like this at something called a Slenderalla Salon. I was intrigued and asked more. She proceeded to tell me a tell me about these salons that existed when she was younger that women would go into to have their bodies shaken in the hopes that it would melt away unwanted weight. It sounded like the worst form of quackery, which is why it stuck in my mind. Years later, when I would start going through old magazines, I would stumble across ads for what I think was a pretty popular, but now largely forgotten chain of stores.