And the first kihon you learn is to take off your shoes. Easy right?
Where do you put them down? How?
Are you reminded of the sanctity of the place?
Of concern for the health of your dojo mates?
Of mental passage from one world into the next?
Of emotional preparation for a wholehearted effort?
...to name a few.
In karate, what you do is mostly always easy. Doing it right is the trick. Doing it right every time is the real trick. And doing that, while thinking of something else, is where the adventure begins.
In fact, we know fundamentals to be so important that the first karate you learn also teaches you how to learn karate. (And for that, we even have our own system.)
It's that simple. If it was easy, karate students wouldn't be so special.