Kensey McMahon has been in a mile long lake, the Gulf of Mexico and the National Open Water Swimming Championships in the United States. 500 yards in the splash pool? That’s no big deal. “Those long races, most of the children stay away, she’s almost like sprint swimming coach Mike Dingfield,” Putonghua. “Eight or 20 laps has not been able to cover up her warm-up.” Mcmahon filled the swimming pool with the fastest speed, long endurance and several American time. It became the first wild horse to be selected as the first “coastal girl swimmer” in the era alliance. High …