I rode my bike to work for the first time just over 3 years ago. The one thing I remember about that first day of riding to work is the endorphin high that I got. The first day of commuting it lasted for about 10 minutes. I just rode my bike back to work from lunch, and I got my endorphin rush. It didn't last but maybe 3 or 4 minutes, but it's still a good high!