We focus on physical strength at EverStrongSF. However, strength in the physical creates strength in the mental. Working through hard physical effort in the gym also creates strength in the mind. That's mental strength. A strengthened mind enables one to create material strength. Material strength means the ability to acquire resources necessary to succeed in life. I'm sure you've heard of people who workout and how it's helped them in their life.
I've written about this on my personal blog. If you are interested in this, check it out here.