A coach of mine once told me that momentum is made up. He said all that really happens is we convince ourselves mentally that we are in a state of retreat, when in reality we are still every bit “in the game” as our opponents are. I 100% agree with him, but the Kansas City Royals may need some more convincing.

After not being in the playoffs for 29 years, the Royals have gone 4-0 in their first four playoff games. In doing so, they have secured themselves a spot in the American League Championship Series and are now just eight wins away from bringing home a World Series Championship. All things seem to be “go” for this 2014 Royals team, and if these last games are any indication, they have no intention of slowing down.

They overcame the Oakland Athletics in an extra innings battle, and then came back only a few days later to sweep the Detroit Tigers (one of the postseason favorites). In doing so, the Royals overcame three of the most dominant pitchers in baseball: Max Sherzer, Justin Verlander, and David Price–and outhit some of the best bats the sport has to offer: Miguel Cabrera, Ian Kinsler, and Torii Hunter. How did they do it?

The answer is simple: with a smile on their face.

“They’re all enjoying it…we get to this type of atmosphere and we’re flourishing,” Royals Manager Ned Yost said after the ALDS sweep. He wasn’t alone in the sentiment–Royals starting catcher Salvador Perez added, “We feel so happy to win the last two games.”

So how can it seem so simple yet do so much? Because in reality, it can be that simple. The influence of a positive mindset is so vastly overlooked in competitive sport, but as we can see through the success the Kansas City Royals are having, it can really make a difference. Especially considering they were up against the odds, on short rest, and playing against one of the best teams in baseball. The impact can’t be overlooked.

Give it a try sometime. Next time you need to do something, no matter how daunting it seems, tell yourself that you can be successful. Put a smile on your face while you do it. Do it again and again until it becomes genuine, and you won’t be disappointed. Change your mindset, and the results will follow.