1. Deep breathing: simply breathe in through your nose and out through your mouth and repeat
2. The box method: breathe in for five seconds, hold your breath for five seconds, and breath out for a few seconds
I don't really know any other but I think those might help for now and when I learn new ones I'll add those to this book

YOU ARE READING
Tactics for if you need to breath
Phi Hư CấuThe title and it's mostly just a book to help