You just don't see it very often. I'm here to tell you how anyone can do it, and it's a great workout if you're short on time. It's not like messing around outside or even a day in the climbing gym. What you can do to get a decent workout with all the comforts of home. If you've ever tried to track your food intake, you know it can be time-consuming.
Different sources provide conflicting information.
Adding it all up can be confusing. Tooling down the waterfront, across the Golden Gate and into the villages of Sausalito and Tiburon on a high-end rental road bike, courtesy of Blazing Saddles. Relaxing on a ferry back into San Francisco. Biking along the ridge at Mount Tamalpais, into Muir Woods and along the Marin Headlands. Not a bad way to get around and get some excersize while visiting the big city.