There are some very basic aspects of a used treadmill that have to be carefully inspected when shopping for a second hand exercise machine of this nature. The process to buy used treadmills is similar to buying a used car and you do not want to waste your money on a piece of junk. Some of the most important parts include the motor and the frame of the treadmill. A bad motor will cause a lot of problems in the near future and can be very expensive to repair. It is also a good idea to ask a lot of questions to learn as much about the machine as possible.
If there are certain things you want from a treadmill, there will be a used treadmill out there offering all the features and functions you require from a treadmill new or used. Things like pre-programmed workout plans in the console are important to some people with very specific goals in mind. Turn on the machine and take it for a little trial run to make sure it feels right. There should be no excessive vibrations coming from the motor and the console should read accurately. Try changing the speed up and down and make sure the incline feature works properly if it is suppose to come with the treadmill.
It is important that the deck of any treadmill is big enough to allow free range of movement. This is more important for large or tall people whose stride might be longer than the typical person. A treadmill with a steel body is something to look for as well since these frames will be able to endure a lot more wear before actually falling apart. Make sure there is enough warranty to cover at least nine month to a year. It should cover parts as well as labor cost to repair anything that might go wrong.