Gritness Inc., a fitness schedule management software maker, has been acquired by athletic gear giant Under Armour Inc. The deal was first reported Monday by SearchMarketing Daily. Tommy Fad, CEO of Austin-based Gritness, couldn't be reached for comment. A spokeswoman for Baltimore-based Under Armour (NYSE: UA) said the company was gathering details for an afternoon announcement. Under Armour already has key local ties. The company opened a tech-based Connected Fitness division in Austin in March,...