I've always been told that if you don't have the incline on at least 1.5 that the treadmill essentially does a lot of work for you. Even at an incline I will run faster on the treadmill simply b/c it will keep me at a constant rate. My speed varies a lot when I'm doing road work. I can't run more than 4 miles on a treadmill though. I get bored out of my mind.


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