There are many variations of breathing exercises that people do. One of my personal favorites is the ‘Wim Hoff’ method. Basically you’re using deep breathing techniques to open your body, lungs, blood vessels etc. By using his method. You can make the body more aware of how much oxygen each cell can handle. And it will compound itself into other things you do. The walking you do later that day, and the workout at the gym, or the sleep you get tonight will be greatly improved by opening up your body with this famous breathing technique.