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This may not be an issue for you yet, but biking is a non-impact exercise. When you run, every footfall sends a small jolt up your spine, puts a strain on joints, etc. Bicycling puts no such strain on your skeletal system; the motion is smooth. I know people who've been biking extensively for 30 years, but I don't know anyone who's been a serious runner for that long; eventually, injuries get them.
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