Runtastic announced an update to its flagship app and that it has had 70 million worldwide downloads, 30 million of which are registered users. The updated app includes a hydration tracking feature that wasn't in earlier iterations of the app.

“We need to continue moving beyond simply tracking and aggregating data,” Florian Gschwandtner, CEO of Runtastic, said in a statement. “The hydration feature is one great example of how we can coach users and help them make a healthy, informed decision, at precisely the right moment, using their unique, personal data.”

The app combines the user's activity data, local weather conditions and specific information about the user to provide a suggestion for how much water to drink.

Over the years there have been many attempts at hydration tracking, from sensor-equipped water bottles with connected apps to patches for a user's body that will measure hydration levels in near realtime.

Runtastic also added a training plan premium feature to its Android app. The company also made a few previously paid features into free ones, including an integrated music player that offers "power" songs and a live tracking function that shows friends where the user is training.

In August, Runtastic reported that it had 18 million registered users and 40 million downloads meaning the registered user base grew by 12 million in six months. At the time, Runtastic had the sixth largest user base for activity tracking apps.

Since August, Runtastic launched a connected, body fat-tracking weight scale, called Runtastic LIBRA, and announced the availability of a new narrative feature called story running -- similar to Zombies, Run. This year, the company's nutrition app, called Nutrition Quiz PRO, made it onto exclusive Apple App Store list of 15 essential health and fitness apps.