Emotions are contagious; we transmit them to others, often without realizing it.

Leaders' and speakers' moods directly influence their teams or audiences, for better or worse.

Managing your emotions is essential—your state can either inspire or destabilize those around you.

If there's one thing we humans are generous with, it's our emotions. We share them constantly—in person, on stage, even online—whether we mean to or not. Emotions spread like infectious diseases, and for leaders talking to their teams, and speakers talking to a room, that's both very good news and very bad news.

The good news first. If I'm genuinely excited about a big win or a new initiative, I can infect my team with that excitement just by talking to them about it. Speakers can do this too: We pass along our energy, our compassion, our grief, our anger, our joy—whatever the moment calls for—simply by feeling it "out loud" in front of an audience. Exactly........

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