Precor has been building equipment to withstand the repetitive, rigorous workouts of health clubs, hotels and spas for years, so they earn their reputation on quality and durability. The Precor RBK 615 delivers a low-impact cardio workout with a variety of challenging preset workouts and a comfortable Air Flex seat that keeps you cool and flexes to support your body. The Precor RBK 615 Recumbent Bike features 6 preset workouts: Manual, Interval, Basic Heart Rate Control, Weight Loss, Random, Hill Climb. The step-through design allows you to easily enter and exit the bike, seating you in a reclining position that takes weight off sensitive areas and distributes it over the seat for a comfortable ride. The Air Flex seat with high-ventilation seat back features a specially-designed suspension system that allows the seat back to move with you for comfort you can really feel. Dual-sided pedals can be used with or without the pedal straps. A touch sensor heart rate monitor built into the handlebars conveniently allows you to monitor your heart rate. Enter your age and weight and the heart rate control workout helps you stay in your fat burn, cardio or peak target zone for a more efficient cardio and weight-loss workout. Or, use any Polar compatible 5 KHz wireless heart rate chest strap transmitter (sold separately). The Precor RBK 615 is covered by a Lifetime warranty on the frame and welds, 10-years on parts and wear items and 1-year on labor.