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Laughing at myself - because I'm thinking, "Where is the LIKE button!?"
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I am recovering from knee surgery and have restrictions. I could blow out my grafts with a mis-step. Saving the natural trails for my doctor's okay.
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I think they are conditioned by their existence as part of the machine. Kind of a structural suggestion. Though really they should only be used for safety. Walking with arms not swinging is stilting - unnatural.