I use PLB mostly to help get my O2 numbers up when they fall below 88%. I can always get it back up in less than 3 minuets. [5 minuets and my DR wants me to go to ER] But I also use it when doing anything strenuous, like climbing stairs, or carrying heavy items.
I found that 'belly breathing' is the best exercise as for breathing exercises. It trains your body to breathe properly. Doing enough it become your automatic go to breathing without thinking. It is better than panic breathing and hyperventilating, you don't get enough oxygen or gas exchange when anxious.

That is what has been working best for me any how. I had to learn what to do to calm my anxiety attacks. And both PLB and belly breathing are taught as relaxation breathing.

Thanks for the input. I am on 02 24/7. Have found found on "Good Days" when I am just sitting watch TV and such, I don't need 02 all the time, and my 02 stays at about 91 - 93. It will occasionally drop to 88 - 89. I do Pursed Lip breathing and it generally comes back. Other days when "Active" I have to Pursed Lip breath frequently to breath "Comfortably '
Have a Great Day and be Safe.

bauf1128
Hello, and how are you doing today? I’m having a lot of trouble breathing. I do a lot of the pursed breathing and I do it with and without my o2. If I walk all around the house doing chores and I don’t realize I’ve overdone it! I hurry and sit and do the breathing technique and my inhaler. I do walking around the house and when I stop or go too long is when I have an attack.
I hope this helped you! Have a Great Day!
Carleen