Meet Cardiglow: a smart wearable device that monitors your heart rate and gives you feedback with LEDs, helping you stay focused on your workout. Cardiglow translates your heart data into colors. It connects to your smartphone via Bluetooth. There is also a vibration motor that helps you keep your workout session on the right track.
Cardiglow gives you instant feedback on how hard you are pushing your heart, helping you exercise properly. You can find out more about it on Kickstarter.