Let's start with some fitness trackers. These examples of wearable tech monitor daily activity such as steps taken, calories burned, heart rate and sleep patterns.
Fitbit makes several fitness trackers. In addition to how they're worn, Fitbits differ largely based on their capability to set goals, track stair-climbing and measure "sleep efficiency." All sync wirelessly with Windows or Mac OSX as well as Bluetooth 4.0 devices, all offer free online and mobile tools and all export data to other fitness apps, including RunKeeper and Lose It!
The Fitbit Force ($129.95) gets the vote here, since it displays the time, measures floors climbed and wakes you with a silent alarm, though the Fitbit One ($99.95) will please the wristband-averse.