It seems like we spend so much of our lives working on something: Most of us spend a good portion of the day at work. We come home and work on the house, or work in the yard. When we have the time, we might work on our bikes, work on our relationships, or find any number of other ways to work. Even when on the bike, those of us that race, end up working on sprinting, or climbing, or whatever our weakness might be. I started putting in heavy base mi