Strap the Phlex Edge Swimming Fitness Tracker onto your goggles, and you’ll have all the insight you need to train. Designed by high-level swimmers, this swimming tracker monitors your heart rate so you know how you’re performing. Additionally, this device analyzes intervals, strokes, pace, and more than 30 metrics. Along with a real-time heart rate monitor, you get a full-blown activity tracker specific to swimming. Using the Phlex Swim app, you can view all your swimming data in one place. Plus, you can analyze your performance over time to identify areas of success and improvement. This stroke analysis device connects to your goggle strap so it’s within reach whether you’re in or out of the pool. Thanks to its low-energy Bluetooth protocol, the Edge has a battery life of up to seven hours, giving you plenty of time to train.