Is Supporting Your Breathing During Exercise Worth the Extra Effort?
https://www.scribd.com/document/1036025251/Problem-Solving-What-to-Do-When-Healthy-Lungs-Tips-Don-t-Seem-to-Help-214928
If you have ever tried to sprint uphill, run a few hard rounds, or even power through a brisk walk and noticed your breathing feels “messy” before your legs do, you already understand why this question comes up