This 34g tracker takes things to the next level, with an array of inbuilt apps. The Samsung Gear Fit2 Pro tracks heart rate, activity, sleep and workout levels, as well as how many calories are consumed and burned. GPS functionality also provides route mapping and tracking. The device’s inbuilt apps present health and fitness information in a simple manner, which users can learn from. Heart rate zones are monitored throughout the day, allowing users to see what influences their pulse. It is also water-resistant to 50m and can be enhanced with a huge range of additional apps, and watch faces.