I love this tip from Zen Habits: 6 Seconds to Relax. Any time you need to relax, just do a two-second inhale, and a four-second exhale. Examples:

B: If you're a Blogger, take a breath each time you click "save" when writing an article for your blog.
R: If you make Reservations for an airline, take a breath each time you book a flight going east.
E: If you're an Engineer, take a breath each time you use your calculator.
A: If you're an Accountant, take a breath each time you see a number ending in 6.
T: If you're a Teacher, take a breath each time the school bell rings.
H: If you're a Highway tollbooth operator, take a breath each time a white car comes through your lane.
E: If you're an Editor, take a breath each time you correct a comma.

Breathing is so crucial to mindfulness techniques. For most people, their natural breath in shallow and weak. Imagine if it was 20-40% deeper every time, what kind of global impact that would have on your well-being?

Further Reading: