Pros:
1. I don't seem to get sick anymore. And I have young children and am a teacher!
2. Did anyone mention that being in shape makes for better lovemaking???
3. More opportunities for meeting and conversing with a many more people than I otherwise would.
4. Most of what everyone else said
Cons:
1. Laundry
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The bicycle, the bicycle surely, should always be the vehicle of novelists and poets. Christopher Morley