When you are short of breath, your breathing can become too fast, too shallow, or jerky. Because of this you may not get as much air into your lungs as possible. 'Controlled breathing' (sometimes called 'pursed lips breathing') will help you to get as much air as possible into your lungs. This may help to ease shortness of breath. It is one way to slow down your breathing and to make each breath as effective as possible.
Controlled breathing has been shown to improve your ability to exercise and also strengthen the muscles that are responsible for moving your chest wall when you breathe. However, it is not always helpful (beneficial) to everyone with shortness of breath. Your doctor will be able to advise you as to whether this is likely to help you.
I didn't find the right solution from the internet.