Members from Whiteman Air Force Base, Mo., balance one of the planks in the “all-aboard” challenge June 17, 2015, as part of the Tucker Leadership Lab in Liberty, Mo. Participants had to figure out how to balance one foot on the board for the duration of a song, with the size of the board significantly decreasing each time. (U.S. Air Force photo by Airman 1st Class Jazmin Smith/Released)