The 1" reversible commercial grade deck and aluminum side rails give you long-lasting durability with the strength and toughness needed for serious home users or light commercial settings. he TR4000i treadmill has a 3.25 HP Continuous Duty DC motor and a 800 lb. central mount incline motor, providing the power and durability needed to support high caliber, performance workouts. Exercise data automatically saves to your USB storage device. Upload to your personal online LifeSpan Fitness Club account, which gives you access to exercise programs and detailed reports of your exercise and health results.