Photos: Exercise bike races all comers, via Web

The power output of the riders during the race. Unlike a race on real roads, you can examine everyone's vital signs while riding. If someone is having trouble, this data will help let you know. Although people don't trash talk each other over the headsets as much as you might think, you do tend to watch the vital stats. These stats are displayed on the attached notebook.

Photo by James Martin/CNET News.com