I mentioned this in another comment already, but this is what’s being done in New Mexico. The mask order was extended to, basically, “wear a mask if you’re out

I mentioned this in another comment already, but this is what’s being done in New Mexico. The mask order was extended to, basically, “wear a mask if you’re outside your house”. This includes exercising outside. Personally, I find that part a bit excessive; however, my understanding is that it’s meant to counter exactly what you pointed out: as long as there are any exceptions, some people will reason their way out of compliance. A 100% mandate is just easier and simpler to follow. I now wear a mask when walking in my neighborhood after I noticed other people wearing masks too. Chalk it up to peer pressure I guess, but to me it’s a very small price to pay if it helps enforce mask-wearing in other contexts.