Rumored to pair up with a future iWatch smartwatch, the app can allegedly track a plethora of vitals, such as your heart and respiratory rate, hydration, blood pressure and sugar, and even sleep and oxygen saturation. It's still unknown if and how such a variety of vitals will be tracked by the two, as there is no equivalent on the market just yet, and though there's a chance that's all just wishful thinking, the prospect is quite exciting.