Heart-rate ring

    This heart-rate monitor is so tiny that it will fit into your pocket easily.

    The device will slide on your index finger, displaying an EKG accurate reading on its LCD with the touch of a button.

    Of course, another advantage of this device would be to have it set to an audible alert whenever your heart rate exceeds or falls below a preset optimal beats-per-minute target zone, letting you know when to increase or decrease your pace.

    Powered by a sole CR2032 battery, it is also capable of calculating calories burned, steps taken, and distance traveled. It costs US$49.95.