Want a fitness tracker that records your movements AND tells you when to get moving? Ladies and gentlemen...the Jaybrid Reign wristband. The Reign can tell you your readiness for activity based on your heart rate variability, which means it will track your heart rate and let you know when you're ready for increased activity. For swimmers who have been left out of the fitness tracker trend, the Reign can be worn in water to record your lap swims. The Jaybird Reign is compatible with Android and iOS devices.