Basically it's a hula hoop, but not the plastic kind from the store, these are weighted (2 lbs) which makes it easier to get the momentum going for a long period of time. IT'S FUN!! The hoop I bought comes apart in sections so you can travel with it or take it to the office in your bag.
I've only been doing it a week but I swear I can already see the difference in my abs & waist. My friend who sold me on the concept has lost 30 pounds in 3 months by hooping every day and following a very moderate diet. She just cut out sweets, fried food and alcohol. Did not even count calories, she went from a size 14 to a 10 in 3 months.
Anyway I do find it really fun and relaxing to do and am encouraged with the results so far. The brand name of the one I got is called "Hoopnotica" although I have not watched the accompanying video, was told it has a lot of rhythmic gymnastic moves and the like, my friend just put on the music a couple of times a day and got moving, that's pretty much what I've been doing.