Dear Hiren , As you will recall, I am now in home quarantine for last 8 days, having got my covid results +very on 7th ( last friday). As you said, I have been doing the HUMMING + DEEP BREATHING for last 4days. Everytime I do it my oxygen level jumps to 98 %. Usually it was 94 to 93. But now for last 4 days mostly 95...96 %. I am doing the exercise 3 times daily 5 min+ 5 min each together. I can see the difference and thank you for the boost. Pls convey my deepest thanks to Shikha ji also. You have kept me so strong minded. I hope to share the news when I am detected - ve. God bless you both. (ALso my sleep has improved) Jeet Ray Choudhury