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Treadmills are boring, and they do most of the work for you, you can fix this by fixing the grade you run at. Running outside is more work, depending on the surface more pounding and demanding for stabilization and harder or softer on the joints.
Treadmills will, however, force you to keep up with them, if you can set them at a high speed that you know will kick your ass, and you have teh discipline not to touch that button.
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