Ben Kaufman wrote:

I find different cadences comfortable in different conditions.

Isn't it good to vary? Something to do with slow versus fast
twitch muscle fibers?

In simple terms: low(er) cadence for strength training, high(er)
cadence for endurance.

When you use a low pedal force (high cadence), your slow twitch
muscle fibers are active. They are the endurance fibers that can do
work for a long time without fatigue. When you use a high pedal
force (low cadence), your fast twitch muscle fibers get recruited to
help in the effort. They fatigue more quickly, but they're great for
sprints or blasting over rollers.
--
terry morse Palo Alto, CA http://bike.terrymorse.com/