My partner has one from the hospital after they cut out half of his left lung. It is painful to do until you get stronger and it is exhausting for him. He ends up going to sleep after doing a nebulizer treatment to get him comfortable again.

I purchased a Areosure lung excerciser from Amazon have been using it about 4 weeks now and I can feel a slight improvement in my breathing so will continue to use it regular.

Makes sense!!! Thanks!!!

Best Lung Power is a Simple Mouth Organ...It works on both your Inhale and Exhale, besides playing any tune to keep you amused and your neighbours cringing...

Another great way is to sing with a Pulmonary Song Group......

Here are 2 Links...You can also use a normal harmonica.....
https://www.youtube.com/watch?v=tGu_1rE8gN0

https://www.youtube.com/watch?v=wbt_XYWYh0w

I have a Power Breather purchased in Queensland Australia. I have been using it regularly not sure whether it does any good but it makes me feel better.