Andrew Huberman· PhD
if you watch top lifters how they do that they will do it through purse lips you can also do it through the nose but you cannot do it through big wide open mouth so I'll show you why so if you you can you folks can try it at home so if you put your hand on your stomach and trying to do an abdominal breath doesn't go very well now for contrast pinch off one nostril take an abdominal breath or