Armstrong's steady rise in cycling peaked at the Beijing Olympics, where she won the time trial. She backed that up by winning the 2009 time trial world championship. Then she stepped away from the sport to start a family. Her son, Lucas, was born Sept. 15, 2010. Armstrong announced her return later that year and was slated to race this year in September's world championships. In a surprising move, USA Cycling bumped her off the team days before the time trial and after she had already flown to Denmark to compete.