Anecdotal of course, but I've found myself getting out of breath significantly faster when doing squats wearing a cloth mask. Deadlifts, bench press, and overhead press not so much so there seems to be something particular to the squat.

To be effective a filter has to be a restriction, how are they showing people with increased performance with a filter?

Unless the filters aren’t working.....

The filter is intended to filter out particles 100 nanometers and up. Air molecules are .3 nanometers.

So a mask can, in fact, both filter out the disease vectors while allowing oxygen in and CO2 out.

This is nonsensical.