I ride because it's fun. It's also healthy, good for the environment, and my gas budget but if it wasn’t fun, none of that would matter. It's what gets me on my bike almost every day, even when I'm tired, not feeling my best, or just not in the mood. No other form of "exercise" has equaled it. I used to love to run but I was injury-prone and couldn't do it every day. I certainly couldn't jog down to the store and come home with dinner. Walking is okay but definitely falls around midpoint on the fun scale. I enjoy it, especially when I'm walking with a friend, but am not exhilarated by it. So I ride.