I tell people, when they are going to court to talk to a Judge, to breathe through their nose. I tell them this, because this gets oxygen to your brain and you can think better.
I do not know about you, but the first thing that happens when I get nervous, and feel on the spot (like when you are standing in front of the judge and he/she is asking you questions) – I stop breathing normally. When I stop breathing normally, I can’t think.
“Breathe” I tell people. “Take in a breathe” than answer the question. Today.com tells about how your breathing alters your body and may cause panic or clam you down – just in the way you breathe.
This is an excellent article and a good read. http://www.today.com/health/here-s-how-slow-breathing-calms-you-down-t109837?cid=eml_tst_20170417