It is my personal belief that many people own bicycles, and that many of those people aren't interested in riding for pleasure / exercise when it is raining, snowing, dark, etc. outside, and that many of those people would ride their bicycle indoors if they had a fun and challenging device...By: jcs7928
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Source: http://www.instructables.com/id/DIY-Bike-Rollers/
builders building a house building a retaining wall building a room addition
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