Fitbit is counting on you to take steps to get in shape. And you can count your steps and fitness by wearing a Fitbit device on your wrist. The company makes the most popular devices in the emerging fitness tracker market with nearly 11 million sold in 2014. Its line of six wearable devices track steps, calories burned, and duration of activity. Other measurements taken by the spectrum of Fitbit devices include sleep duration and quality, heart rate, and distance and route. All Fitbit devices sync with computers and some sync with apps on mobile devices to show feedback. More than 45,000 stores carry Fitbits including Best Buy, Target, Dick's Sporting Goods, as does Amazon.com. The company raised $380 million in an initial public stock offering in June 2015.