For triathletes, runners, cyclists and endurance athletes who want to optimize their training. ZoneOptimizer adjusts your heart rate zones, making every session more effective. Sport profiles guarantee a quick and easy switch between different sports. Improves performance with endurance training programs, downloadable from polarpersonaltrainer.com with the Polar DataLink. Provides heart rate even in water with a comfortable and disturbance-free hybrid transmitter. Race Pace helps control your speed to reach your target time.