So you want to become a better swimmer? Smart trackers such as Swimmerix can help your cause. This is a smart tracker that provides you with accurate measurement and real-time feedback. It consists of a base, wristband, and an app. The device is capable of measuring your heartbeat and showing your laps, strokes, time, distance, and calories burned.
The base can be mounted on any pool wall to send useful feedback to the wristband. The wristband has a heart rate sensor to track your performance. The app is compatible with iOS and Android devices. More information is available on Kickstarter.