Looking at Apple website for the watch, it says here: "During a dedicated cardio workout, the Workout app built into Apple Watch shows real-time stats like elapsed time, distance, calories, pace, and speed for a variety of the most popular activities, including running, using the elliptical, and cycling indoors or out". I'm interested in the cycling portion. How does it know? I'm currently using Garmin vivosmart which doesn't take account of cycling as part of activity. Was there details that I may missed from the keynote ?