“Fearlessness is like a muscle. I know from my own life that the more I exercise it, the more natural it becomes to not let my fears run me.”
Who said it: Arianna Huffington, founder of The Huffington Post
“To run” something means to control or lead it. For example, “He runs the business” means he is the boss or the one in control of the company.
When you are fearless, then you are not afraid. For example, the sentence “He will do anything because he is fearless” means that he is not afraid, so he will do anything.
This quote compares muscles to being fearless. When we exercise our weak muscles, they become strong. Likewise, if we practice being fearless, then it only gets easier to be less afraid.