The most important one is actually perspiration. All that will prepare the kids to perform better in social situations once they move into the adulthood. They have a much younger next tier, plus rising stars. It can improve mental healthstave off cognitive decline, boost your sex life, and make you more creative.
This feels like a good place to stop for now. With eyes on the recent Olympics, and its celebration of global athletes, that familiar narrative of sports as a pathway out of poverty is particularly salient.
I also, FWIW, think tennis is a genuinely three dimensional sport: you move from side to side, forwards and backwards, and play the ball anywhere between an inch off the ground and seven feet off the ground. Serena Williams is a much better tennis player than David Goffin.
Secondly, along with facilitating to socialize, sport improves the understanding of the discipline of people.
By making you healthier, exercise helps add years to lifespan — and it improves health span as well, meaning that fit people stay "physically younger" and more capable during those years. On top of that, you increase your endurance.