Stick your thumbs under your overalls and take a deep breath. Try to relax your shoulders and you take in air, but let the in breath "lift your thumbs!"
Exhale and rest and try again!
When you breathe deeply, you (1) breathe into your belly, (2) expand the side body/rib cage, and (3) lift the collar bones. "Farmer's Breath" helps you practice breathing deeply!