Try doing CrossFit in a mask. I had gotten the Under Armour ones that are somewhat quilted and they stand away from your mouth and nose. If it's a really long WOD they still get wet inside but they don't get sucked into your mouth like the cloth ones.
When I was abroad, masks were required 100% Always, without exception, vaccinated or not.
But, the stores were all selling a simple elevated frame device for a few bucks to elevate the mask cloth-like material, so it did not rest on your nose and mouth and become saturated with saliva and even sweat, as the temperatures were sometimes unbearably hot.
I think they called it a bridge. I had to bike long distances for transportation and although it was not perfect and carefree, it offered some relief from the stifling nature of a flat mask.
I workout in the open air, as I enjoy the fresh cool air, greenery and the oxygen provided by green trees and plants. But, I understand your plights, as I was once a lifetime member of Jack Lalanne Fitness Centers, and used to attend everyday, especially since they used to have dry heat saunas, large swimming pools, steam and jacuzzis.