I really enjoyed this one! For me, when I'm a tightly wound ball of restless energy, I can either completely wear myself out physically or (like you did) I can practice mindfulness-- deep breathing, meditation, qigong, or yoga. Both of these approaches were the same way for me. If I'm taking short, shallow breaths I know I'm stressed, restless, or just not at ease. It's hard to believe most people think that shallow breathing is normal. That kind of explains the state of our world.
Hmm what an interesting connection. Maybe the world would be a better place if everyone took the time to slow down their breathing...