This smartwatch is perfect for runners, with 24-7 activity, calories, sleep and heart rate tracking. The device provides a comprehensive set of fitness tools, such as a five-minute fitness test. It also offers running programmes for different targets, from 5K to marathons, and can be switched to reflect various sport profiles. The device can be synced with the Polar Flow app for additional features, such as training load monitoring. The 51g M430 also allows smart notifications and is available in orange, white or black.