Then just play pickleball. It's virtually the same thing for the topic at hand.

Yes, that has become a problem for tennis players, but it's a quite recent problem. Before pickleball became popular, though, free public tennis courts were widespread in urban and suburban areas. Perhaps not in rural areas, though I can't speak definitively on that.

It isn't uncommon for farmers to settup something in their barn for whatever sport they like. the maintenance bay has plenty of space for tennis or whatever.

Pickleball nets are often portable and good co use with Tennis courts. That’s what we do

Plus pickleball is popular so you will find more people to play with

Pickleball will not provide high-intensity exercise.

It has some moderate sections of exercise depending on length of play but it’s a great way to keep moving regardless which is great (and other intrinsic benefits)