Step 1: Lift your left foot and jump your right foot at the same time, as shown below:

Step 2: Put your left foot down, and put your knees down vertically as far as possible without bending, as shown below:

Step 3: Put your left foot down and push your right foot backward, as shown below:

The fourth step, be sure to pay attention to these two feet are moving at the same time, as shown in the figure below: