It supports 18 sports modes, provides real-time feedback, and analyzes the body's energy reserves using its own Body Energy system. GPS support with Google Maps integration is provided for outdoor activities, and advanced sleep and stress analysis helps you monitor not only your physical but also your emotional state. The device is made of titanium and can withstand immersion in water up to

It monitors health indicators: it counts your heart rate, steps, activity, and measures your sleep and recovery after exercise. But its main feature is that there is no subscription fee for the app. A Whoop subscription in the US costs between $240 and $360 per year. The Polar Loop costs $200 once, and replacement straps cost another $30 each. But there are no subscription fees (at least for now)