Mental strength isn't usually reflected in what you do. It's more often seen in what you don't do.
In her book "13 Things Mentally Strong People Don't Do," Amy Morin writes that developing mental strength is a "three-pronged approach." It's about controlling your thoughts, behaviors, and emotions.
Check out the graphic below to see what mentally strong people don't do.
Mike Nudelman/Business Insider
This is an update of an article originally written by Steven Benna.
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