Moov is behind a couple of awesome smart wearable trainers already. With Moov HR, you get a heart rate workout coach to push your body the right way. It guides you through heart-based, high intensity workouts and pushes you to stay in the right heart rate zone.
Moov HR has a sensor that uses LED light to illuminate the skin and measure changes in light absorption to provide accurate results. The device is waterproof and can be used with a sweatband or swim cap for challenging fitness sessions. Available for as low as $59.95.