Bowflex SelectTech Dumbells
I usually Tivo past the Bowflex home training system commercials (most commercials, for that matter). But somehow I caught an ad for their SelectTech Dumbells and was pleasantly surprised. Offering the versatility of a full rack of free weights in the compact form of one heavy dumbell, these weights are perfect for home training in limited space. To use them you just dial the desired weight in to the handle and when you lift the handle the bar will pick up the necessary plates to create the weight you set.