I'm trying to get back into deep abdominal breathing. That's of course when you take a deep breath and hold it with the muscle in your gut, then slowly let it out. And then do it all over again. It's something I first learned in an acting class I took in college, which didn't wind up turning me into an actor. It's a rather energizing way to breathe, and when you start on it you might actually feel a bit of a high. I fell out of the habit before. Now I'm trying to do it so regularly that it becomes unconscious.
This time of year sniffles and other respiratory mischief become more common, so it's harder to do any kind of breathing without thinking about it. But I'm not giving up.