Kids ran from station to station.At one, they hopped from foot to foot on brightly-colored plastic risers, while at others they did push-ups and sit-ups. While it might have looked like a school P.E. class, the students were working out on a recent afternoon at the Forsyth County Family YMCA through a new program designed to encourage wellness in youngsters. Kerry Carithers, senior membership and wellness director, said the program, called Endurance: Jump Start, had 55 kids ranging in age from 6 to 13.