RowTrike is the trademark name of the "Vehicle For Exercising" that is the title of United States utility Patent Number 7,654,545 invented by Matthew S. Millirans that was Issued on February 2, 2010 by the United States Patent and Trademark Office.

Here is a video of the prototype explained and demonstrated by the Inventor, Matthew S. Millirans:
Here is a video of the Adult Model and the Youth Model being demonstrated by enthusiastic youngsters:
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License of Patents and Trademark available.