New treadmill simulates mountain trekking;
A new tricked-out treadmill from NordicTrack simulates mountain trekking with its steep 40 percent incline and 6 percent decline.
While the allure of the gym -- climate-controlled, convenient and predictable -- is obvious, especially in winter, emerging science suggests there are benefits to exercising outdoors that can't be replicated on a treadmill, a recumbent bicycle or a track.