Step 1: Lift your left foot and jump up your right foot at the same time, as shown in the following figure:

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:

Step 4: Make sure these two feet move at the same time, as shown in the following figure: