The Sony Xperia Product Blog has posted a few different scenarios where you can use your Sony Smartwatch. if you are interested in it, I would recommend that you head over to their blog.
2. Take a run (or walk, or cycle) with Endomondo Sports Tracker. It acts as your personal trainer and social fitness partner, letting you track your workouts and challenge friends. With SmartWatch, you can access your performance stats on the move and break your personal best without needing to look at your phone. SmartWatch’s splash proof screen also lets fitness junkies monitor performance when braving the rain.
This one is my personal favorite. Have you looked at their usage scenarios? What’s your favorite?