The Core Trainer from Panasonic is the rage in Japan and is now available in the United States.

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One of the hottest fitness trends in Japan right now, believe it or not, is a horseback-simulation machine made by Matsushita Electric Industrial, called Joba, the Japanese word for horseback riding. Get ready, because the machines are making their way to the U.S. under Matsushita’s Panasonic consumer brand and have been renamed to"core trainer."  The price is $ 1,995 and available from Panasonic, and Hammacher Schlemmer.   

See Core Trainer Video (Complete with horse training footage)
Panasonic Core Trainer web site

We all may laugh, but as the price drops, this may actually be a great training aide.