For long Covid this might help. i just thought will send this. The acidic pH in absence of oxygen might help as the SARS-CoV2 virus had issue replicating in high altitude.

Those having long Covid *can do walking without inhaling air in breath.* To the level of comfort. In absence of oxygen the CO2 is built up. Say in cycles of one minute. This elevated CO2 influences the pH to acidic and that will interfere with the viral replication and provide immunity by altering & inactivating the virus. This absence of O2 will be anaerobic glycolysis with high lactic acid.

Acids have shown to denature the protein coat of virus. Here the CO2 formed in the body before being released from lung is being used to slightly alter the pH to inactivate the virus. The lactic acid also in muscles the way it stiffens in absence of oxygen.

When tested in positive long Covid patient One feels relief from symptoms after few days and the symptoms of long Covid reduce in intensity.

One can few times a day 3-4 say while walking for 5-10 minutes . Or once for say 30 minute walk what ever time one can exhale the breathe and continue walking. By understanding the level of one's comfort. THIS IS ONLY FOR PEOPLE WHO ARE NORMAL HEALTHY WITHOUT ANCILLARY CONDITIONS but have long Covid

Idea is using the acidic pH to alter the virus in the arterial blood by the CO2 forming carbonic acid and the acidic pH will do the work.

https://www.insideprecisionmedicine.com/topics/coronavirus/covid-19-causes-heart-attack-and-stroke-by-inflaming-arterial-plaque/