Don't like cycling in foul weather? Deathly afraid of H2's? Too many pedestrians ambling along in the bike lane got you down? Consider this do-it-yourself indoor riding setup via Instructables that uses free motion floating rollers...for a more realistic indoor cycling experience. The total cost for this home hack job shouldn't run you any more than $35-$40 + a little elbow grease.
From the video it looks like it works pretty well, however you may want to consider wearing a helmet indoors if you plan on hopping on this thing. For more information including the step-by-step build instructions, visit Instructables