Nope. All model flying is technically not exercise. You could fly a whoop inside, or one of those micro helis.
However if you are on private land away from other people it is going to be hard to enforce. I have closed private fields, which has enabled some lockdown flying. I am a long way from any other people or property as well.
It's not legal here in San Diego, CA right now either.
One of the clubs here reported that a member decided to go fly at an empty lot behind a department store. Law enforcement saw his plane in the air, and promptly pulled up and wrote him a ticket for $400. They told him he was under "stay at home" orders, and getting out to fly a model airplane did not constitute exercise, which the current rules are classified as.
You can argue it, but let's be honest, you're trying to find a creative loophole to get around the intent of the current lockdown.