Valslide allow you to slide around the floor and exercise. They look really cool. You can easily take them with you. Two are ONLY $29.99. jValslide
Sounds really cool huh. The thing is it's a non-invention. They have been using a nearly identical product to move furniture for years. A quick online search lead me to Uhaul where you can get four for only $13.99. And I know I purchased a few a while back at the dollar store!!
When will it end? Isn't it bad enough we pay over $2 a pound for what is essentially scrap iron?