We have seen plenty of wearable devices that can track your workouts and show your smartphone notifications. The InBody Band happens to be a smart device capable of analyzing your body composition. The micro AC current flowing from two electrodes at the top to electrodes at the bottom enable the device to measure body impedance, which in turn can be used to measure muscle mass and body fast.
The InBody Band measures your heart rate and monitors your sleep and activity. It can also give you heads-up when you have an incoming call or notification. The device and its companion app let you compete with others to stay motivated. The battery life is good for up to 10 days. You can find this project on Kickstarter.