Leaders should not smile.

A smile shows invitation and is usually underused by leaders. It shows you are a friendly person, and people can easily approach and talk to you; it's welcoming and can help you connect with your team!

Check out this interesting video about the major benefits of smiling more often: https://www.youtube.com/watch?v=KSf1rgIaxqU

Source: Carol Kinsey Goman, “5 Ways Body Language Impacts Leadership Results” on forbes.com, 2018 Photo by Rebrand Cities from Pexels