I honestly cannot fathom the amount of negativity in the comments to this story. I went to YouTube and watched some videos of this "fad" and it was very interesting and fun to watch. It reminded me of the hackey-sack craze or stilts or pogo sticks. As with any activity, there are costs to buy equipment. Anything that young people find to keep them out of trouble is a good thing. Competition is a good teaching tool.