In this episode, host Lauren Thompson interviews NASCAR driver Jimmie Johnson. He discusses his workout routine. Thompson also visits an elite swim facility in Charlotte, NC, and Coach David Marsh reveals his techniques for developing Olympic swimmers. Golfer Martin Kaymer relives winning "The Players Championship." Finally, retired United States Marine Josh Sweeney discusses his recovery from an IED explosion and winning a gold medal in the Sochi Olympics. Part of the "Heart of a Champion" series.