Toughness that makes us resilient in life is rooted in both psychology and physiology. Born out of inspiration and evolving into habits and discipline, the physical and mental challenges we endure each day are what make us resilient to stress. No one is immune to stress, but with the consistent movement outside our comfort zone, we find toughness on the other side. https://www.stewsmithfitness.com/blogs/news/psychological-and-physiological-challenges-create-both-mental-and-physical-toughness