According to a study published in the Journal of Strength & Conditioning Research, walking or running indoors requires less effort than moving at the same speed outdoors. Researchers tracked how much energy people burned walking outside and on a treadmill, and found that choosing a 3 percent slope on the treadmill best matches the energy requirements of walking on flat ground outdoors. So if you add the incline to your walk or run they are both beneficial for fitness. And as cold as its been lately the treadmill may be your preference. But when possable get out and enjoy nature.
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