Here is some first-hand (literally!) information:
Apple Watch is a convenient extension of your iPhone, as well as your “Fitness Partner.”
As an extension of your iPhone (you must have an iPhone 5 or newer to use the Watch), the Watch does much of what your phone does: texts, email, phone calls, maps, weather, sports scores, music, headlines, apps, and yes, even the time!
As your “Fitness Partner,” the Watch tracks and records your activity and workouts. It reminds you to do three things: 1) stand and walk around at least once an hour, 2) burn enough active calories to meet or exceed your goal, and 3) exercise for 30 minutes, either all at once or a little at a time. The built-in Heart Rate Monitor takes your pulse every few minutes; you can see your resting heart rate and work toward your target heart rate.
I must admit, the Apple Watch is cool. Very cool. In only five days I’ve become quite, um, attached to it.
Well, I need to go now. My Watch just beeped. Exercise time!
Want to learn more about the Apple Watch? Check out the Apple Store website: http://www.apple.com/watch/