BOSTON (Reuters) - While the United States' swimmers and track athletes have had to endure cut-throat qualifying competitions to secure their places in the Olympic Games, triathlete Sarah Groff has had the luxury of a year to prepare for London. Groff, 30, will be one of three U.S. athletes to compete in the women's triathlon on August 4, starting with a 1,500 meter swim in the Serpentine lake in Hyde Park and followed by a 40-kilometre bike ride and a 10-kilometre run. ... More...