"When you need to slow down and come back to yourself, you do not need to rush home to your meditation cushion or to a meditation center in order to practice conscious breathing.
You can breathe anywhere.
Even if you are at a shopping center filled with people or waiting in line at a bank, if you begin to feel depleted and need to return to yourself, you can practice conscious breath and smiling just standing there."
- The Complete Idiot's Guide to Zen Living.