The Hoover Presidential Library Association and the city of West Branch, Iowa co-host a national championship each year.
In general, the game is played on a volleyball-type court of grass or sand and involves throwing a heavily weighted medicine ball over the net.
Officially, in Hooverball, the medicine ball weighs about 6 lb (2.7 kg) and is thrown over an 8 ft (2.4 m) volleyball-type net.
While on a trip to South America, Hoover observed a game of "Bull-in-the-Ring" being played on the Battleship Utah.
Both power and control are important for a good throw, and can be achieved simultaneously with proper technique.