"For example if you want to burn calories you could increase the gradient of the treadmill."
"Hill Profile
This setting gives you a variety of hill profiles to choose from and automatically adjusts the incline of the treadmill accordingly. Running on hills is more challenging and will ultimately improve your fitness and burn more calories in the process."
http://www.weightlossresources.co.uk/exercise/running/road-v...

...i wiele innych przykładów.

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On the other hand, treadmill advocates cite two key advantages of treadmill training: with treadmills, they say, it is possible to perform outstanding 'hill' workouts by setting the treadmill inclination at challenging levels.
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http://www.pponline.co.uk/encyc/treadmill.html