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| Posted: 08 Mar 2011 10:15 PM PST Running on treadmills is easier than running on an equivalently flat distance outdoors because the ground is smooth and there is no wind resistance. A common misunderstanding is that it is easier because the ground is pulled beneath you. But the movement is relative and it would be the same as running on the deck of a ship which moves relative the terrain. Studies measuring the difference find that an average person running between 5 miles per hour (8.0 km/h) and 9 miles per hour (14 km/h) will expend between 0 and 5 percent more energy running outdoors. A person running outdoors faster than 10 miles per hour (16 km/h) (6 minute mile pace) will expend up to 10% more energy than an indoor runner. Treadmills can approximate the additional effort of running outdoors by setting the incline to 1%.
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