UPDATE 1-Adidas buys fitness tracking app maker Runtastic

* Adidas pays 220 mln euros for Runtastic

* Nike was ahead in fitness tracking with FuelBand and Nike+

* Recent Under Armour deals gave it 120 mln users (Adds details, background)

FRANKFURT, Aug 5 (Reuters) - Adidas AG has bought fitness tracking app maker Runtastic, giving it access to a community of 70 million active users and helping it catch rivals in connected wearables.

The German group said on Wednesday it had completed the acquisition from majority owner Axel Springer SE, along with the company’s founders and an “angel” investor, in a deal valuing the Austrian company at 220 million euros ($239 million).

Rival Nike Inc was a pioneer in fitness tracking, teaming up with Apple Inc on the Nike+ running programmes for the iPod and iPhone and launching the FuelBand in 2012.

Adidas has been losing market share in sporting goods to its bigger U.S. rival and launched its own miCoach fitness device only last year.

Fast-growing Under Armour Inc, which last year overtook Adidas as the second-biggest sportswear maker in the United States, earlier this year bought diet and exercise app MyFitnessPal for $475 million and social fitness network Endomondo for $85 million.

Under Armour said those deals had given it a total of 120 million registered users on its Connected Fitness platform, which it said made it the largest digital health and fitness community in the world.

Adidas said Runtastic offers over 20 apps covering a variety of endurance, health and fitness activities in 18 languages. ($1 = 0.9200 euros) (Reporting by Georgina Prodhan and Emma Thomasson; Editing by Edward Taylor and David Holmes)