It is key as a leader to show enthusiasm for what you do. That can come in the form of being vocal, being energized, excited and mostly being fun. That enthusiasm is contagious (not might be or could be). That contagion spreads and therefore generates enthusiasm across your teams.
What we have to be aware of is what threatens our enthusiasm as a lack of it is also contagious. Once we know what threatens it we must look at what we do to reenergize and build it up when it wains. Think of ways to inspire yourself especially early in the day so your enthusiasm is shared
Read an article on leadership and be inspired, check out photos of trips and loved ones, smile at memories and plan to make more.