This is a GPS-enabled running watch that has advanced features from general activity tracking to more in depth running analysis, personal best tracker and customized personal goals. The M400 consists of two models, one comes with an inbuilt heart rate monitor, and one that has to be wirelessly connected to the Polar H7- so keep in mind which would be best suited for you. This Polar watch allows you to set your heart rate zones for a more targeted and intensified training session and summarizes your workout afterwards. And if all that doesn’t quite have you convinced, you can enable smart notifications to receive messages and emails or calls when synced with your smartphone.