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IIRC, Precor had patented the shape of the ellipse they use as being the most natural movement. I have found it to be less “sharp” at the ends of each movement, but unfortunately they are mostly commercial sales and their residential versions don’t seem to hold up. I am also looking for an alternative and have arrived at getting the Tread. I really liked the form factor and ergos. I figure it will help me keep moving even when it’s raining, too cold or hot outside.
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