In my case, I bounce because I frequently toe-walk. Being up on my toes and either not touching the ground with my heel at all or only touching down lightly with my heel makes my entire gait more springy and bouncy.
I find I can take that bounce out by wearing shoes that prevent me from toe-walking -- combat boots, for example. The trade-off, though, is that I can't walk as far in heavy shoes that hold my foot down to the ground without experiencing a lot of pain, especially the next day when the exertio catches up with my muscles.
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"In the end, we decide if we're remembered for what happened to us or for what we did with it."
-- Randy K. Milholland
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