In everyday walking, the body weight is first shifted forward, then the front leg pulls the body forward. Beyond the center of gravity, the other leg sets in front and thus the step is completed.
When this step is combined with a karate technique and executed quickly and powerfully, the body reaches normal speed and generates ordinary energy. So everything is normal and natural - nothing out of the ordinary. In a step in karate, first the back foot is pressed to the ground, and then it starts with a great and fast force. The pressing accelerates the body forward at the very beginning of the movement, with an energy that is continuously transmitted forward through the whole body. This initial momentum creates momentum that flows through the entire movement to the finish. This is the correct way to move forward in karate through a normal step - ayumi ashi.
Here you will find all information about the techniques in the video