An anonymous reader quotes a report from the New York Times: Jay Blahnik was a fitness superstar with a book and nearly two decades of work with Nike before he was hired in 2013 to work on the Apple Watch. He became known inside Apple as the creator of the watch's signature fitness feature: three circular bands that people could complete through the day by exercising, standing and burning calories. Marketed with the tagline "Close Your Rings," the concept helped galvanize sales of Apple's first…