Watch out, Nike -- in the footrace for domination of the huge and growing digital fitness market, a competitor just leapt into contention. Under Armour, a major manufacturer of fitness and sports performance products, acquired MapMyFitness -- a company with one of the largest digital fitness communities.
MapMyFitness current has over 20 million registered users, many of who use the company's popular Map My Run, Map My Walk, or Map My Fitness
