LONDON (Reuters) - In the four years since Kristin Armstrong won the Olympic time trial in Beijing, she has had a son and changed her training regime to fit in with family life. The thing that has not changed is her drive for gold on Wednesday. The 38-year-old American took some time off cycling to start a family, but could not resist the urge to get back on the bike after all. "A lot of people ask why I made the comeback after winning an Olympic gold medal and world gold medal, what more is there," said the rider from Boise, Idaho. ... More...