The World famous professional treadmill. Star Trac 4500HR is the current model as seen in the 24 hour fitness centers. Impact Absorption System. The innovative sports utility display features: Dynamic Heart Rate control; Polar Telemetry Heart Rate; Hundreds of pre-programmed training selections; Built in rack for a water bottle, personal stereo & towel. This consol also incorporates the Personal Trainer Studio mode, which enables personal trainers to customize and store their clients walking and running programs. This treadmill goes to 10mph and has 15% hills and can be used all day.