Contact: Robin Waxenberg - (212) 489-8006 rwaxenberg@nyc.rr.com Ellen Satlof - (214) 637-6282, ext. 159 ellen@nata.org DALLAS, March 28 – It’s not an Olympic sport yet. However, with its tumbling, flips and other high-flying stunts, cheerleading has evolved into a highly athletic, organized and competitive activity for participants of both sexes, ages five and above. Between 1990 and 2002, participation in the sport increased 18 percent and injuries more than doubled, according to a study in Pediatrics, official journal of the American Academy of Pediatrics.