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Riding a dirt bike on an MX track is the toughest workout I've ever had. I don't seem to get a lot of arm-pump but virtually every other muscle in my body seems to scream after a lap or two.
What are you guys doing for dirty fitness? Riding in the woods is really taxing as well, but doesn't seem to be as bad as MX does. I feel like I need a lot more core strength and a bunch more cardio endurance.
I run a little bit and do spin class a little bit, but at the end of the day I'm a decent-sized guy (6'3", 220lbs) getting thrown around a lot.