+1
I thought the same thing when I saw lunacycles's post. If you're climbing at 6 mph on a road bike, that's pretty steep, probably over 10% grade. A mile at 10% is a very different animal from, say, four miles at 5%. I'm not going to say one's harder than the other, they're just very different in terms of body mechanics and strength demands.
In Ohio, a mile and a half is about as long as they get, but there are plenty of hills that are just so steep you'd have to have both super strength AND teeny gears to get over them without standing up. I'm told "the Wall" in Pittsburgh is 32%.Don't know if that's true or not, but you get the idea.
Edit: Pittsburgh's Canton Street is a verified 37%, according to the local paper. And cobblestone. I don't know how the bricks even stay in.





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, give muscles used while sitting a break and make use of some other ones. Yet, those "other ones" need to get into shape for this, plus it takes more cardiovascular strength to stand.
Anyways, he's all for standing, but doesn't do it the entire way up a long climb. If it's a short climb, he'll usually stand all or most of the way. If it's a long climb, he'll do a little of both for the above reasons. He trains his legs to do both and gets the most out of them this way.