How can tennis can help your body?

To me it isn't important.

To the average person it means nothing.

To the average player it provides a modicum of physical exercise and probably helps with their fitness.

To the parents of children forced to train regularly to ensure a financial return in the future it's importance is blown out of proportion at the expense of their offspring's childhood.

To the financial backers of professional tennis competitions it is super important, as they are able to sell advertising and broadcast rights for vast sums of money.

To the professional players who have trained all their lives to make it to the top of the tennis world, I'm sure it is very important.

But on the grand scheme of things, that we are but a speck on the dot of a tiny planet in an unimaginably vast cosmos, it mean very little.