Prince Charles was a keen Polo player

All the men in the Windsor family play polo: Prince Harry, Prince William, Prince Charles, and even Prince Philip and King George VI have been Polo players.

MM

From his youth until 1992, Prince Charles was an avid player of competitive Polo. He continued to play informally, including for charity, until 2005. He played for 40 years, breaking several bones in accidents. He once described Polo as "my one great extravagance" but a persistent problem with his back led to his retirement from the sport.

Source: wikipedia.com / Polo Weekly