One hand Operation

The key to any kind of training device is to make it easy to use and view.  Training watches like the Polar A300, the Garmin Forerunner 920XT, and Garmin, Viofit Activity Tracker make it easy for you to view your progress and fitness level at a glance to your wrist.  Other activity trackers and pedometers provide the same type of functionality. The ability to send that data to your smart device or home computer via a blue tooth enabled device is a big plus in keeping track of your progress or sharing that data with a like-minded community.