If someone believes that they will deal well with stress, they generally do physically deal well with stress. The stress response (ie. the physical response to fear) ends quicker after a negative arousal for people who categorize themselves as resilient, suggesting resilience is not just a psychological phenomenon.
REFERENCES
Tugade, Michele M., Barbara L. Fredrickson, and Lisa Feldman Barrett. “Psychological Resilience and Positive Emotional Granularity: Examining the Benefits of Positive Emotions on Coping and Health.” Journal of personality72.6 (2004): 1161–1190. PMC. Web. 9 Mar. 2018.14/541870