The Jawbone Up is a physical bracelet and mobile app that makes tracking your health incredibly easy. The band is worn around the wrist and tracks the number of steps you’ve taken, stairs climbed, and quality of sleep, among other metrics. The mobile app presents all that data in a beautiful and easy-to-understand fashion.

They’re growing incredibly rapidly, and I think it’s desirable not only because both the band and the app are beautiful, but also because it ties into people’s desire to improve their health and wellness.