Wikipedia
Hooverball
Hooverball is a medicine ball game invented by President Herbert Hoover's personal physician, Medal of Honor recipient Joel T. Boone, to help keep then-President Hoover fit. 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. The game is scored like tennis. The ball is caught and then thrown back. The weight of the medicine ball can make the sport quite physically demanding.