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I can see a stationary bike or eliptical, but not a treadmill. First off, a treadmill uses electricity, which is a cost beyond the equipment itself. Secondly, walking on a treadmill for a long time hurts my knees - a treadmill can exert sideways force on my joints if I am not perfectly timed to the machine's pace. I would bring up noise, but considering the hallway meeting taking place nearby, I would probably prefer the whirling from a machine.