Treadmills
Treadmills are one of the most popular machines for cardio exercise, and many people use them at the gym or purchase one for home use. A treadmill "works" by moving a belt underneath the exerciser's feet. The belt's movement forces the user to walk or run at a certain speed. Some treadmills also can move up and down at one end, simulating walking or running up a hill and requiring the user to put in more effort. Power is needed to make the belt move, or otherwise the treadmill is basically useless for exercise.
Manual Treadmills
Some treadmills are powered by the user's feet. These treadmills are usually manufactured for home use. The treadmill belt is set at an angle so that the belt naturally moves downward when the user steps on. The user has to keep walking or he or she will fall off the belt. Once the user steps off the treadmill, the belt comes to a stop. Manual treadmills are cheap, don't use electricity and are less bulky than electric treadmills. However, they may not have a variable incline and the belt may be hard to use, forcing users to grip the handlebars and decrease workout efficiency.
Motorized Treadmills
Motorized treadmills are the most common type of treadmill, both at home and at the gym. Most motorized treadmills are powered by two electric motors. The treadmill rests at a flat incline. When a user steps on and presses a button, one electric motor starts the belt. The belt can vary in speed depending on the user's preferences. Another electric motor raises and lowers one end of the belt, creating an incline. If you're shopping for an motorized treadmill, look for one with 1.5 horsepower or higher, and with continuous horsepower. That should give you a treadmill with enough power to suit your needs.
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