Non-motorized treadmills stick to the basics.
This lack of extra components makes manual treadmills the least expensive options in any treadmill buying guide.
Manual treadmills can also be difficult to get started, making the experience less enjoyable and more likely to cause strain to the joints.
Heart rate monitoring - Many treadmills come with a clip or band meant to monitor your heart rate.
Gyms offer swimming pools and are full of weight machines and equipment like treadmills, stair climbers, and stationary bikes.