Aura Strap for Apple Watch
Apple Watch is already a great fitness device. Aura's smart Strap should make it even better. Using bioimpedance sensors mounted on the strap, it keeps tabs on fat, muscle mass, minerals, and body water, providing a deeper look at how exercise (or lack thereof) is affecting the wearer's body. The sensors are water-resistant to 50m, can operate for six months on a changeable coin battery, and are mounted on a comfortable fabric strap.