Spot on, they are certainly not as effective and it's twice the work for me for maybe a quarter of the results I get from a normal sized body. After each session you always ask the person how they're feeling. Cannot think of any normal sized person or even some small fats who come out saying they don't feel any better. Get an obese and they're going to waddle out of the room, mean mug you, tell you that they don't feel anything different, then under tip or not even tip at all. If I walk out to a new client and they're huge, it's came to the point to where I don't even try to hide the disgust on my face anymore.