The treadmill is one of the most reliable, time-tested pieces of home gym equipment on the market today. What started out as a fairly basic machine has evolved into something a little more complex, however, with all kinds of fancy options available to average consumers. Here is some basic information to help you wade through all those bells and whistles, so you'll know what kind of treadmill will work best in your home gym.
You must consider two primary issues when looking at treadmills. Will you use it more for walking or for running? How much space do you have for a home gym? With those issues in mind, we'll discuss manual, motorized and folding treadmills, along with some of the common options available.

Non-motorized treadmills do have their advantages. For one, they are much lighter and easier to transport than motorized treadmills. Manual treadmills are also easier to fold up and store out of the way. It is a little more difficult to get the belt moving on a manual treadmill, of course, because your feet and legs are the motor. Many do not have an adjustable incline either. However, if you want something inexpensive for light use, a manual treadmill would work fine for you. Otherwise, get a motorized treadmill.

Horsepower, specifically continuous horsepower, is the most important aspect of any motorized treadmill. A continuous horsepower rating of 1.5 to 2.5 is probably sufficient for most people's home workouts. However, if you plan to do a lot of running, you may want to go with a little bit more. Always choose a DC electric motor; it will run quieter than an AC motor. This is especially important if you like to watch TV while using your home fitness treadmill.

If you want to save space but still workout on something motorized, get a folding treadmill. After each workout, you can fold the platform up so the whole machine stands vertical, occupying less space. Make sure you get something stable--early folding treadmills were a little wobbly. Today's models have improved, though, and many models are about as stable as non-folding treadmills.
You'll also want to know if the treadmill utilizes hydraulic cylinders to make folding easier. If not, folding the treadmill each day might become the biggest part of your workout. Finally, think about whether or not you will be moving the treadmill around much after you fold it up. Supposing you plan on pushing it into the corner or storing it in a closet, something with a good set of sturdy wheels (preferably wheels that don't make contact with the floor until the treadmill is folded) would be a must.

Other features
The size of the belt will make a difference in your workout. Make sure you get something wide enough and long enough for you to have a comfortable workout. That will depend on your body size. A pulse meter can be a valuable tool to help you monitor your progress. Grip pulse monitors on the treadmill frame are probably the easiest to use, since you don't have to worry about any wires getting in the way. Also, note how high an incline you can set. An inclining belt adds resistance to the workout, which helps you build and maintain muscle tone. If you go with a motorized exercise treadmill, get one with pre-programmed exercise routines you will actually use.
How can I prolong the life of my treadmill?
Make sure you get a treadmill with a weight limit of at least 50 pounds more than your weight, just to be on the safe side. This will help you avoid unnecessary wear and tear. Each treadmill description at Overstock.com includes the weight limit. Keep your treadmill free of dust and sweat. Also, check the owner's manual to find out how often you should lubricate the underside of the belt with silicone spray. Avoid using other types of spray lubricants, as they might damage the treadmill.
Is it worth to spend the extra money on a motorized treadmill?
The cheapest of cheap treadmills are manual. If you don't plan on using it very much, then go ahead and get one. Most people will probably want a motorized treadmill, though. They are easier on the joints because you don't have to strain so much when you start the belt moving, as you would on a manual treadmill. You will also get a lot more variety in your workout using the computer on a motorized home treadmill. Overstock.com has lots of motorized discount treadmills with plenty of horsepower for your regular workouts, so money shouldn't even be an issue.
Walkers
If you do a lot of walking but not much jogging, you probably don't need something with too much horsepower (1-2hp should be sufficient). You can also choose a less expensive folding treadmill, since stability is not as important an issue as it would be for a jogger. Overstock.com has plenty of quality folding treadmills with hydraulics and wheels for easy set-up and take-down. While you're at it, get some core training equipment, like an exercise ball or resistance band, to help make your home workout complete.
Joggers
A stable running platform and good motor are a must for the jogger who trains on a treadmill. Get something with at least 2.25 continuous horsepower. If you go with a folding treadmill, make sure it is heavy and durable. Folding or not, Overstock.com has gym style treadmills for sale every day of the year. They will stand up under years of use. While you're here, browse our selection of comfortable fitness apparel.
Exercising doesn't need to be painful, especially when you do it in the privacy of your own home. Get started on building your personal gym with a discount treadmill from Overstock.com. Your healthy body will thank you for taking advantage of amazing deals on quality exercise equipment.