Many people know ping-pong.
It's the game that is usually played in the basement with an opponent, with plastic paddles in hand that made the distinctive noises when a ball was struck. A fun game it was, sort of like playing T-ball with huge yellow plastic bats or nerf football. But like those two familiar games, ping-pong also has a real sport behind it. As a sport that emphasizes endurance and reflexes above simple size and strength, people of all ages and genders can play on an equal field. The equipment can be had for a reasonable price, and the sport is played indoors so year-round competition and practice is possible.