Jenna Martin has been selected to run in her third IAAF World Track and Field Championships. The 25-year-old from Bridgewater was named to the women's 4 x 400 metre relay team that will compete in Moscow, Russia from August 10-18. Martin says a coach wanted her to be a part of the team, even though she wasn't part of the group that qualified. She says she has mixed emotions.Martin flies to Kamen, Germany on Wednesday for training before leaving for Moscow August 7th. This will be Martin's third world championship after competing in 2009 and 2011.