Countdown to UFC 175: Chris Weidman vs. Lyoto Machida

Go behind the scenes of as two undefeated champions prepare to defend their titles against hungry challengers at UFC 175 on July 5. After making history by beating Anderson Silva -- twice -- middleweight king Chris Weidman prepares to face former light heavyweight champion Lyoto Machida, a training partner of Silva who's undefeated in his new weight class.