Skateboarding involves riding and performing tricks on a skateboard. It originated in the 1940s-50s as surfers looked for something to do when waves were flat. Early skateboards were wooden boxes or boards with roller skate wheels. In the 1970s, new polyurethane wheels improved traction and performance, fueling skateboarding's popularity rise. By the 1990s, street skateboarding dominated as tricks focused on rails, stairs, and other urban terrain. Skateboarding continues to evolve and remains a popular recreational activity and sport for both youth and adults.