Boston Marathon champ Meb Keflezighi talks tech, training Since 1993, the long-distance runner has kept track of his workouts. For months, Keflezighi has trained for the race using an Epson Runsense SF-810 fitness watch that monitors his heart rate, pace, distance, elevation drop and elevation gained. The company known for its printers and ink cartridges introduced its Runsense line at the Consumer Electronics Show 2015 in Las Vegas. [...] there’s the Apple Watch, which can serve as a fitness device and motivator with its built-in Activity and Workout apps. Last summer, a PricewaterhouseCoopers survey found that 21 percent of people in the U.S.