Stress — like everything really — is not simply a psychological problem. The body plays a big part in our experience, and, it turns out, our capacity to deal with it. From mindful.org:
A new study in the journal Biological Psychology suggests that people with better body awareness tend to feel less stressed. That’s no surprise, perhaps, if you’ve already been practicing mindfulness, but may seem odd otherwise. Stress leads to a physiological response, such as increased heart rate or sweating.
Participants who reported themselves less overwhelmed by a challenge also noticed their physical state sooner that others—with brain scans suggesting they were able to reign in anxiety before it escalated.