Xterra Fitness TR6.6 Treadmill Review First impressions from pictures of the Xterra Fitness TR6.6 Treadmill suggest that it is an impressive, professional machine and the specification enhances this positive image. It promises to offer a large 20×60” running deck with XTRA Soft cushioning, a 7.5″ widescreen console with blue backlit display and a 3.0 CHP motor among its many features. Are buyers happy with their...