Your treadmill should be strong enough to cope with the level of use you are going to ask from it. This means
that you'll be looking for a treadmill that will go as fast as you want it to (some cheaper ones can only really cope with jogging
pace for better runners).
Checklist
1)Top Speed - This needs to be as fast as you want to run (or hope to run in the future). The very fastest treadmills move is
about 25 kph, but to go above about 20 kph is going to cost you quite a lot of money. Most runners will find that a top speed of
16 kph (or 6 minute mile pace) is enough.
2) Your treadmill should have a decent motor - 2-3 horse power is a good starting point for this
3) The tread area should be a good size - 50 x 140cm is a good size to aim for. The size is important as you will travel around
a bit, particularly when you get tired.
4) You may wish to have an incline facility to replicate hills. This is either don't by hand or by the motor - the later being
good as often you can change the incline during a run to keep interest (some will pre-program routes for you with inclines).
5) Treadmills usually have readouts of speed and distance, you may wish to also buy one that has calories burnt or a heart rate
monitor as well. The HRM can be good, particularly if you know the individual training zones for you (which usually needs lab testing)
6) The running surface of your treadmill is important. Some of the more advanced ones have variable rubber footing, which
cushions your landing and therefore reduces your injury risk.
7) Remember the basics, like will this treadmill fit in the space I have for it at home!
Overall, buying a treadmill is a big purchase you are going to make, so think carefully before spending money that you later regret.
If you think you'll
use your treadmill a lot - then it is worth going for a more robust model that will, in the long run, save you money by lasting
a lot longer. Once you have one make sure you keep it clean and dust free and this way it will last you a lot longer.