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On an island outside of Seattle, Washington, a guy named Bill Kirschner took some time away from his main job, building animal cages, to fiddle with a new idea, fiberglass skis
By having contact with other parts of your body, it invariably spreads the load
Youre biking and pushing and pulling at the same time, so its low-impact, but as far as working muscles and getting the most out of any kind of interval session, its probably the best bang for your buck, he says
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