I don't want to hijack the thread, so could you simply elaborate regarding the physical demands? My wife and I are interested in taking Rescue Diver. But if I understand this right, it's physically demanding. My wife is not very strong at all and is about at capacity just carrying her weight belt and an AL80. She's unlikely to be able to carry me, much less a larger or fatter person.
Last thing we want to do is sign up, only to find she can't handle it physically.
That is the beauty of a rescue class.
People learn what their limitations are, how to deal with and work with those limitations, and how to work with others to affect a rescue.