Surfade lite idag och hittade en sajt för en enhjuling.
Den är några månader idag så ni kanske redan har sett den men den ser inte desto mindre intressant ut för det.
http://www.focusdesigns.com/default.aspx
Det finns video till den också:
http://www.focusdesigns.com/media.aspx
"The SBU is an electric self-balancing unicycle. It controls the forward and backward balance while the rider balances left and right. Its a unique blend of machine and human balancing. The rider controls the speed by leaning forward or backward to speed up or stop. There is no need to pedal, in fact there are no crank arms, just foot rests. The SBU keeps upright by utilizing advanced electronics including accelerometers and gyroscopes with sophisticated balancing algorithms. "
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Banging your head against a wall uses 150 calories an hour.