These days, it seems, we’re all more familiar with feeling stressed than with feeling calm. Luckily for us, we’re designed to relax. The breath is our route to relaxation, and our senses help to personalize the process. The heart lifts slightly when we inhale and drops slightly when we exhale. Because it is the only muscle in the body that never stops working, it has to have built-in breaks. Exhalations are the heart’s resting phases.