Performance-gear maker Under Armour, which has been increasing its efforts in the digital-fitness space, has said it will acquire MapMyFitness for $150 million. Austin-based MapMyFitness makes a family of iOS and Android apps – MapMyRun, MapMyRide and MapMyWalk – that track workouts and allow people to share those maps through the apps. MapMyFitness claims over 20 million registered users.