The same basic muscles: yes. In the same way? No. I cycle exclusively, and let me tell you--even though I can ride 50 miles, I cant run more than 3 miles without being *obscenely* sore the next day. Sure, they both kick ass on your legs, but in a much different way (if that makes any sense).
I doubt you would be able to do both of them hard in the same day without overtraining. Cycling *will* develop your legs, though. All the amateur riders I know have bigger, more well defined legs than anyone Ive ever seen who wasnt a professional bodybuilder.
And while cycling is a non-impact sport, don't think that it isnt without its injuries--Im dealing with a nasty bit of tendonitis in my knees from trying to adapt too quickly to the hillier terrain up here at school.
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