In reality, I can't think of a sport where you can play in a more isolated way. As long as you maintain margins entering and leaving the court, people could be permitted to play tennis. Golf is another game where people can easily maintain a 6 foot or greater distance. Of course no audiences could be permitted for tournament play, but permitting people to play shouldn't be a problem.
I believe that as they begin to think these things out, they'll be able to open up such activities, but scheduling and payment will clearly be done online, just show up at the proper time and play.
Besides walking while maintaining distance, if they really think things through I believe there are other activities they could permit. Maintaining sanitary conditions would be demanded, but I believe that over time they'll find ways of safely opening up many things. I suspect that we'll be using masks until a vaccine is available in many activities, and frankly I don't know if a party with lots of people will be possible for some time, even if all are friends who believe they're fine. Perhaps the worst problem with coronavirus is that you can spread it without ever feeling sick, and you may never get sick, but someone who gets it from you could die. It's a nasty disease.
Gary
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