We’ve all got a load of tools (or skills) in our leadership toolbox. And each of them serves a specific purpose. We have communication skills, relationship-building skills, problem-solving skills, influence skills, listening skills, and so many more. But there is one skill that many leaders have easy access to but just don’t put into practice very often. Really, it’s not so much a skill but a behavior. In fact, it’s really just a simple action. The number one tool, we as leaders, can put to use every single day is the simple act of smiling.