Running everyday is good exercise but it is extremely hard on many parts of your body. The constant impact of your feet on concrete reverberates through your ankles an on up through the knees and legs. Over time, jogging can end up being detrimental and that is one of the reasons for the surge in popularity of elliptical machines.
Health clubs have started to make the switch from treadmills to ellipticals as many of them now have about the same number of each machine. A good elliptical machine will give you much the same workout as running on a treadmill but with much less stress on the legs. Elliptical machines give you an aerobic workout with a smooth gliding motion instead of the pounding you get while running.

The NordicTrack Apex 8500 Treadmill truly absorbs the impact of running. The Patented Reflex Deck reduces joint impact by as much as 40% compared to running on pavement. The Apex 8500 allows you to run longer, which allows you to burn more calories and attain fitness goals of all levels.
In our treadmill reviews of the Apex 8500, we found the arch-shaped Reflex Deck responds to each step taken. This deck flattens and absorbs the impact before springing back to propel the user’s next stride.

The ProForm 780 CS Treadmill is a good-looking treadmill perfect for the home. Out of all our treadmill reviews, the Proform 780’s sleek styling and state-of-the-art accessories make it one of our favorites. But the best part about the 780 CS is that it is one of the most comfortable treadmills in the industry.
Driven by a 2.25 horsepower Mach Z commercial motor, this treadmill is also implemented with the ‘Prosoft 3′, an adjustable cushioning system that limits stress on knees, ankles, and hips. So if the streets have done a number on your knees like they have on mine, this well-priced machine is ideal for runners whose bodies won’t let them pound the pavement every day.