Intriguing rumours around Apple's entry into the growing health & fitness market, centred around an iPhone "Healthbook" app. We can be pretty sure Apple is exploring the wearables/sensors space, but wouldn't it also be interesting if they were to support data from the rapidly expanding collection of third-party devices too? There are so many of these now, each with their own set of incompatible apps, that someone needs to bring that data together in a meaningful and usable way. If that's going to happen, I don't want it to be Google that's looking after that data.

Besides fitness tracking, a marquee feature of “Healthbook” will be the ability to monitor a user’s vital signs.

The application will be able to track a person’s blood pressure, hydration levels, heart rate, and potentially several other blood-related data points, such as glucose levels, according to our sources.

The software is also programmed to allow users to enter details about their medications so that they could be reminded to take pills at scheduled times. This will likely integrate with iOS’s existing Reminders application.