Here is a smart gadget that turns your Apple Watch into a body composition, water level, and activity analyzer. The AURA Strap 2 gives you a detailed breakdown of your body composition and tracks your fat, muscle, water, protein and a whole lot more. It works with Apple HealthKit.
The AURA Strap 2 combines with your phone to let you easily set and achieve your fitness goals. Simply choose the body you want and the Aura app will help you build it. To get started, touch and hold the sensors on the strap for 30 seconds and you are set. The AURA Strap 2 works with Apple Watch Series 3 to Series 7.