cadence

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Think fast twitch=explosive=rapid cadence=high bulk="white meat".
Slow twitch=endurance=slower cadence=low bulk="dark meat."

You know, that's really interesting. Run? hahaha. No. I took martial arts for years because I can't run to save my life. So I decided I should just disable my attacker and walk away at my leisure. I can hike with a heavy pack forever, I seem to be able to build endurance very quickly.

At any rate, it makes sense, and I'll watch to be sure I'm not jerky on the bike to protect the knees. Bad knees run in the family in the form of cartilage that just falls apart over time (listen close and my right one sounds like Rice Krispies when I bend it) - but I haven't had any knee pain yet. If anything I think my knees are better for all the riding - more muscle, less dependence on structure for support/movement.

Anyway - thanks for all the input!