This water-resistant smartwatch is all about functionality, with built-in heart rate monitoring, GPS and 24/7 activity tracking. Runners can track their daily and long-term progress, as well as their performance levels. The device calculates how many calories wearers have burned, based on their weight, height, age, gender and heart rate. It also monitors steps and distance, using GPS to map out routes for outdoor activity. The tracker assesses sleep duration and patterns and warns users if they are inactive for too long. The Polar M200 also displays smart notifications for incoming calls, texts and social media interactions.