TULSA – After a run in amateur boxing, Cherokee Nation citizen Cheyenne McKinney continues her career by teaching and coaching children the sweet science. McKinney opened Cheyenne’s Boxing Gym at 102 N. Greenwood Ave., Suite 124A in the Greenwood District. She said working with children and teaching them what she’s learned motivates her. “My goal is to try and get the kids more active, especially the youth ages 10 to 16,” she said. “For me, that age range is where hormones are going and attitude