USA TODAY Sports' Rachel Axon has a chat with American long jumper and defending Olympic gold medalist Brittney Reese.Reese divulges what it's going to take to be the event's first woman to win back-to-back golds, how she was mentally able to overcome injuries and retirement ponderings, and what it has been like being a first-time mother while balancing her already-hectic schedule.Follow Rachel on Twitter at @RachelAxon, and follow Brittney on Twitter at @DaLJBeast.