Johnston is a
left-handed polo player. In the 1950s, he organized polo matches on his family farm in McDonald, Tennessee. He later founded the Chattanooga Polo Club, later known as the Bendabout Polo Club. He served as the long-time president of the
Gulfstream Polo Club in
Lake Worth, Florida. He served as vice president of the
United States Polo Association from 1979 to 1989, president from 1980 to 1984 and as chairman from 1984 to 1988, and still sits on its board as a governor-at-large. He owns the Flying H ranch in
Big Horn, Wyoming, home to the
Flying H Polo Club, and the Everglades Polo Club in
Wellington, Florida. In 1982, he was awarded the
Hugo Dalmar Trophy for exemplary sportsmanship. On February 17, 2001, he was inducted into the
Museum of Polo and Hall of Fame. He is a proponent of the return of polo to the
Olympic Games. ==Personal life==