Now in its third year, the online project 30 days of Biking starts tomorrow. The only rule for 30 Days of Biking, April 1–30, 2011, is that you bike every day for 30 days—around the block, 20 miles to work, whatever suits you—then share your adventures online.

You can register to part of the movement or just personally commit to do it. If you share your experiences via Twitter, use the hash tag #30daysofbiking.

Last year, my wife Amy wrote about her experience participating in 30 days of biking. You can also get inspired by our recent My Ride winning entries and maybe enter yourself!