The TR4000i treadmill from Strength Master is one of the best in the fitness industry, with innovative technology and sophisticated features. The treadmill has a consistent surface that is much easier to navigate than sidewalks, curbs, or trails, and it reduces the risk of tripping. The TR4000i folding treadmill has performance-tuned hardware as well as intelligent fitness-tracking technology. Mile after mile, a 3.25 hp motor, and a dependable all-steel frame provide ideal running conditions for any workout. The 20" x 60" running surface is supported by 8 compression shocks, ensuring a comfortable stride. When you're finished, the treadmill uses EZfold technology to fold down to a small size for unobtrusive storage. Your exercise data is synced directly to your smartphone using a Bluetooth adapter that is available.