According to a new leadership book, Compelling People, those effective influential leaders are good at two qualities: strength and warmth. "Strength is your capacity to make things happen with skills and willingness while warmth is the sense that you share the same feelings, interests, and view of the world as the person you’re speaking to."
“It sounds simple, but doing these two things consistently makes a big difference. Posture is the number one way to project strength. There’s a reason standing at attention is one of the first things military recruits learn. Similarly, smiling is the most common way we project warmth.”