If the tightest-fitting, most specialised mask does not affect my oxygen saturations, even when exercising, please rest assured that a simple fabric face mask, the type we are asking the public to wear when outside your homes, simply cannot affect oxygen levels of a normal healthy person. This is fake news. Wearing a mask can help others. If everyone (who can) does it, we all help each other. I did about 1 minute of burpees. My heart rate at the end was around 80-90, but the machine had trouble picking my pulse up for the first 20 seconds or so. ----------------- More Medlife Crisis: http://www.medlifecrisis.co.uk/ https://twitter.com/medcrisis https://www.facebook.com/Medlifecrisis https://www.instagram.com/medcrisis