You, too, can run, cycle or walk across the U.S., much as the actor Tom Hanks did in "Forrest Gump." Or, rather, you can do it on your computer. Researchers at the Lawrence Berkeley National Laboratory in California have developed a Web site and tool that allow you (and training partners) to log your daily mileage at home or in the gym, and track your progress on a virtual trip from Yorktown, Va., to Florence, Ore. The site -- by means of photos -- shows you exactly what you would see if you were actually making the transcontinental trek.
To learn more, visit exercise.lbl.gov.