Stephanie Gibson was one of nearly 1,300 U.S. Masters Swimming members who participated in the SmartyPants Vitamins USMS Winter Fitness Challenge between Feb. 15-28. The event was the first of USMS’s inaugural Fitness Series, which includes the Summer Fitness Challenge, a 2K swim between July 15-31, and the Fall Fitness Challenge, a 1-mile swim between Nov. 15-30.