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runnersworld.com: A great magazine for both new and experienced runners. Lots of great online articles and tips to keep you motivated and healthy.
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mapmyrun.com: Map your running route!
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niketown.com: Looking for a training group? Wear your Team World Vision jersey to a Niketown group run. You'll have people to train with (and you'll obviously have the best looking shirt around).
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active.com: Free training log, nutrition info, pace calculator, injury prevention tips...they've got it all.