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Message: [QUOTE="schmanman, post: 1168919, member: 74723"] I do 50 mile mountain bike races up in the upper peninsula. while dirtbiking, especially with an old heavy bike, you get a bit of a workout, but nothing like a mountain bike. now, I have never ridden mx, so I'm not sure of thew workout there, but I'm guessing it not quite as grueling as riding through 50 miles of sandy uphills, tight turns, etc. (on a side note, I want to dirtbike the trail SO bad!) [/QUOTE]