Price

Price will most likely be an important factor in your decision. You should choose based on what features you require. Will you be using the treadmill for walking or running? If you are going to be using it more for running, you will definitely want to invest in a machine with a higher horsepower (HP) motor and superior deck cushioning.

Treadmills under $1000
At this price range you get a treadmill that is primarily good for walking and lighter jogging. These treadmills are designed for home use and are fine for individuals who are not planning on using the machine for heavy daily use or for long-term training purposes.

Treadmills over $1000
At this price range you will find heavier-duty machines and ones that are designed for commercial (gym) use. They will withstand more frequent and intense usage. These will have larger motors, stronger belts and more fitness programs. If you are planning on using your treadmill everyday and are training for races, then you want to consider investing more in your machine.

Types

Manual vs. Motorized
Manual treadmills work by having your feet work against the deck to move the belt. They will only go as fast as your legs determine. When you are trying to get the treadmill to your ideal speed you may have to work a little harder and this could affect your joints. However, they are very reasonable and you can get one typically for under $300.

Motorized treadmills work by having a motor run the belt for you. You can adjust the speed and incline, and most have workout programs that can vary your routine for you. They can make you work harder than you normally would as the moving belt motivates you to keep up. These machines are more expensive but offer a lot more features that can keep you interested in your exercise routine in the long term.

Folding vs. Non-folding
Buying a folding treadmill should not be seen as a compromise on quality. If space is at a premium then a folding treadmill is a good choice. Just make sure to check that it is easy to fold and put away for easy storage. However, if you have room and your machine will be stationary and has a permanent home, then a non-folding model is a good choice.

Fitness Goals

A treadmill is a great way to get started on your fitness goals. Whether using it for walking or running, your body will benefit from regular exercise. You want to choose a model that will meet all your current needs, and perhaps your future ones as well. As you work out regularly you will find that you will want to increase your incline and speed, so make sure that your treadmill can grow with you.