Endurance junkies can be data nerds. The market for smart watches and wearable fitness devices has boomed, trending toward a $29 billion dollar market with 243 million units sold by 2022 according to an industry analyst’s estimates. In the world of endurance sport, professional athletes and weekend warriors alike are recording their workouts and analyzing the results using platforms like Strava, Polar Global, or Garmin Connect in search of optimal training to achieve personal bests. ...