Bored with your biking routine? The folks who run B-cycle have a challenge for you — and it will make you a rock star. The rules are simple: Visit all fifty stations in one day, taking half an hour or less between each one, and return to the station where you started. Does it sound tough, wimp? Well, at least 142 people have done it so far, and their names are all listed on B-cycle's website. It's not a race, it's a challenge, but make sure to e-mail info@denverbikesharing.org first to let them know you're coming. Otherwise you won't get your free T-shirt and poster, and your name won't be engraved on the Internet.