My first day of bicycling to work

I inherited my brother-in-law's old mountain bike and decided to start biking to work. Our office has a shower to encourage people to bike to work plus I need to start thinking about getting into better shape. My route is basically to go down Telegraph Avenue from Rockridge towards Downtown Oakland and then cutting over to Clay to avoid Broadway which is always packed with cars. The only issue I found was that Clay is a pretty narrow street that runs along City Center and the Federal Building so there's always a fair amount of delivery trucks. Maybe I'll cut over one more street to Jefferson next time. Overall, it felt good to bike in. Since I'm going downhill in the morning, I'm not sure how I'll feel tonight when I have to bike back uphill. Hopefully after a few weeks of doing this, my body will build up the necessary stamina. No pain, no gain, I suppose.