The impetus behind the raucous run by Dirk Nowitzki and the Dallas Mavericks last spring? Um, turns out there was a girl in the boys' room. But not that kind. This kind: Throughout the playoffs Dr. Mary Collings laid her healing hands upon Dirk's aching back in a crack-ya-bones sorta chiropractic way. But Collings, a '93 graduate of Dallas' Parker College and founder of Las Colinas Spine & Sports Medicine and a second office in Highland Park, didn't just work her magic on Dirk. Last year alone she treated the Stars, Cowboys punter Mat McBriar, ESPN's Darren Woodson, PGA player Brandt Jobe, actor Chuck Norris, singer Alanis Morissette and even the Highland Park High School "Belles" drill team. During the Mavs' playoff push and into the NBA Finals, Nowitzki and guard J.J. Barea were weekly visitors to Collings' office.