Meet Cardiglow: a smart wearable device that monitors your heart rate and gives you feedback with light to help you figure out how hard you are pushing your body. The Cardiglow chest strap provides you with continuous biofeedback by translating your heart rate into colors. It is designed with athletes and active people in mind.
Cardiglow is compatible with Bluetooth smartphone or smartwatch. It also has a vibration motor to keep your workout sessions on track. Yet another interesting Kickstarter project.