Whether you're training for the next triathlon or taking the stairs at work, the?Forerunner 945 Music GPS Running/Triathlon Smartwatch?from?Garmin?is designed to be with you every step of the way. The Forerunner 945 is engineered to not just track stats and goals, such as distance and time, but also your health. The smartwatch features a wrist-based heart rate monitor and Pulse Ox sensor in addition to tracking your VO2 max based on customized heat and altitude settings.