I've been a treadmill runner for almost 15 years (age 66) and do from 40-60 miles per week, running virtually every day. I started with very inexpensive treadmills from the local sporting goods store and quickly started burning them out and having them replaced under warranty until, after my 7th replacement, I broke down and bought a used True 450 for very little money. It is built like a tank, has a great belt and motor and is the quietest treadmill I've ever run on including some $6-7,000 mills in health clubs. When this one finally gives up, I'll be buying another True for sure. Good luck.