For a slightly different viewpoint - cycling is the most weight-loss-friendly exercise I've ever done, for the simple fact that I can maintain a moderate intensity for long periods of time. Running is just too demanding for me (and most people, I think) to do for the same amounts of time that would be considered a medium-length ride (2-4 hours). I almost always drop a pound or two when I increase my mileage significantly. (... but maybe I'm kidding myself and that pound is coming from the upper body muscle I'm losing from less time in the gym
- anyway my pants fit better -)
Plus, to me, terrestrial exercise really suppresses my appetite - I have to force myself to eat after a ride to replenish my muscle glycogen. (Swimming, OTOH, always makes me ravenous.
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Speed comes from what you put behind you. - Judi Ketteler