A lot of treadmill models out there offer the support for inclination. And just like climbing a hill or running up a slope in real life, inclined treadmills can be useful for burning more calories. While an inclined surface is not the best option if you are just starting to run, it is a great way for taking your workouts to the next level. Some treadmills even offer a decline option which trains your muscles in a different way as it emulates running downhill at high speeds.