Squash has its origins in the older game of rackets which was played in London’s prisons in the 18th century. Later, around 1830, boys at the Harrow School noticed that a punctured ball, which “squashed” on impact with the wall, offered more variety to the game. The game spread to other schools. The first courts built at the Harrow School were dangerous because they were near water pipes, buttresses, chimneys, and ledges. Natural rubber was the preferred material for the ball. Students modified their rackets to have a smaller reach to play in these cramped conditions. In 1864, the school built four outside courts.
引用元：Squash (sport) – Wikipedia https://en.wikipedia.org/wiki/Squash_(sport)