A scanning display, which rotates the readouts through one window, can produce a feeling of disorientation because you have to keep your eyes on the panel while you work out. Make sure the display shows speed, distance covered, incline and time elapsed. Push-button controls are better than dials or switches . Sliding switches can be imprecise and stubborn to move. You should be able to push control buttons while you're running.
Welded frames are sturdier than bolted frames .
The less jarring and jiggling, the better. These models absorb shock, are light and easy to move, and don't rust. Some exercisers think handrails are a nuisance because they impede arm movement, but experts say they're necessary for safety . Rails should be long enough for you to reach without having to walk too close to the front of the treadmill. Note that some models, like the Precor 9.17, don't have side handrails at all.