It's healthy. It's environmentally friendly. It's almost like flying.
I ride to work every day, and I love it every day. Rain, shine, heat, cold, headwind, tailwind, tired, peppy, fast, slow, flat tires, broken spokes, it's all good. If I feel a little tired, I just go a little slower. A bad day on the bike is better than a good day in a car or bus, though it's hard to be sure, since there haven't been any bad days yet.
I like commuting because I ride every day. Twice. Nine miles in, 13, 16, 22 miles home. No decisions. No finding time. No hesitation. Get on the bike and ride. Can there be a better way to start the day or reward at the end?
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If it ain't broke, mess with it anyway!