Don Bartletti/Los Angeles Times/MCT
U.S. Marine Lcpl Darryl Charles, 22, participates in a yoga class at the Naval Medical Center in San Diego, California, on June 10, 2013. He lost his right leg above the knee after he stepped on an I.E.D. in Afghanistan in October 2011. Other veterans are on the floor for the one-hour class, designed to calm the mind, increase flexibility and improve physical strength.