Give it a try:
Lightly wrap your lips around a drinking straw. Take slow shallow breathes letting yourself inhale and exhale through the straw.
What happens in the area of your diaphragm?
Does your breath become deeper and easier?
What happens to the tension in your face and neck?
No straw? Softly purse your lips. Inhale and exhale taking shallow breaths as if you were breathing through a straw.