This is a mock-up of a rumored iOS 8 app called Healthbook. According to multiple reports, iOS 8 and Apple’s iWatch will have a focus on fitness.
The mock-up is meant as an idea of what Apple may go for with its fitness-based app. We don’t know much about it other than what’s rumored. Heck, even then, we don’t know much about it. It’s supposed to work somewhat like a stack of cards that users can swipe between, according to MacLife.
We’re sure we will learn a bit more about it this summer if it’s a real thing. Apple usually holds a software showcase at WWDC each year.