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A. Depending on your location and routes, outdoor treks may offer a few slight advantages. In cold weather, walkers may burn more calories outside because the body uses additional energy to keep warm. Going against the wind and up hills also makes muscles work harder. But there's no need to worry if you're a treadmill regular. To get similar benefits inside, set your machine on an incline and vary your speed at different points during your workout. And don't forget that walking, no matter where, is better than not exercising at all.Burn more fat with our treadmill workouts. Get started here.