Joined: Jan 2008
Posts: 5,831
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From: Hint: check out my BF name
Bikes: 2016 Parlee Altum, 2013 Cannondale Super Six Evo Hi Mod Di2 only, 2011 Cannondale Super Six, Dura Ace 7800, 2007 Cannondale System Six Dura Ace 7800, 1992 Bridgestone RB-1, MB-2, MB-3, MB-5
A couple of thoughts that are related and a bit more application oriented:
1) Generally, the more bent over I get (the closer my torso is to the top-tube), the more power I generate; and when I want to generate more power (but, not in a sprint situation), I tend to get more bent over. I think this lower/more-bent-over position recruits relatively more glute and hamstring than when sitting more up.
2) Again, generally, when my quads feel sore over a period of days or more when walking up stairs (while off the bike, of course), I know that I am using too much quad in my stroke; I will adjust my position to recruit more glute (and hamstring).