In a world where fitness tracking seems dominated by Garmin and Strava, it's easy to overlook other devices and platforms. The good people at Polar have their own training/tracking platform: Polar Flow. You set a goal such as 5k run on a certain date. Polar Flow then provides a customized training program that varies in daily intensity and distance leading up to the targeted event. All free and in several ways more comprehensive than Strava premium Works with Polar smartwatches and bike computers. Also, Polar Flow is one of the few platforms that will automatically export swim activity heart rate data to Strava from a Polar watch (e.g. V800).