Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists cover
Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists
by Lennard Zinn
ISBN: 1931382433
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jrockway · 2011-12-29 · Original thread
Not sure why this is downmodded so far, so I'll give a citation that says exactly what I do:

http://www.amazon.com/Zinns-Cycling-Primer-Maintenance-Build...

Some exercise is going to be better than no exercise, but training for a marathon and "getting exercise" are vastly different activities.