Whether brain or brawn—there are two worldviews about where strength comes from.
Some believe strength is arbitrarily bestowed from above. We are on the earth are mere objects of favor and misfortune. Those with more stole it from others in this grand, zero sum game called Life. Only the poor understand wealth.
Others believe strength comes from hard work and choosing battles wisely. Working people are strong in mind or body or both. Peaceful people don’t deplete themselves of their energies and are fierce when roused to arms.
Both have unfair advantages to exploit and hard choices to make.