Keys fitness treadmills have become quite popular because of their many benefits

Keys fitness treadmills are new in the market, as they started their business operations in 1997. They have a good range of low to medium priced treadmills available in the market. Various types of Keys fitness treadmills are available in the market. They are Alliance Fitness, Milestone, Health Trainer, Discovery, Keys Conventional, Encore and Pro series. 

Independent reviews have shown that low and medium priced Keys fitness treadmills are performing quite well. Here is a brief description of some of the popular models.

- Alliance Fitness Series: These are high quality keys fitness treadmills aimed at high-end specialty dealers. They offer 10 years warranty on motor and life long warranty on the frame.
- Milestone Series: This series is found in the reviews more often than the other brands. It also has 10 years warranty on the motors.
- Pro Series: These are the cheapest of all the treadmills. The motor sizes are very small and the warranty is short with 1-2 years cover on parts.
- Conventional (non folding) Series: This treadmill dominates the market in terms of both price and power. It also offers 10 years warranty on the motor.
- Encore Series: Motor sizes range from 2.0hp to 2.5hp and the warranty is offered for 10 years.
- Discovery Series: This is smaller and slightly less powerful than the Encore series.
- Health Trainer Series: This is slightly broader with motor ranging from 1.5hp to 3.25hp.

Keys also make treadmills for another brand named Smooth Fitness. They are the largest online seller of fitness equipment. They also offer free shipping on all keys fitness treadmills purchased from them.