Up to this point the beats have used only three limbs but as mentioned before, good drummers have control over all four limbs. The left foot is most commonly used to control the opening and closing of the hi hat cymbals.
The hi hat played with the foot is notated in the same position on the staff as the bass drum, except that an X symbol is used instead of a notehead. Practice the example below which uses only the left foot. As with previous examples, keep a steady tempo and aim for a consistent sound and volume.
Once you are comfortable with the previous example, play a drum beat using the left foot on the backbeat instead of the left hand. Since you are opening and closing the hi-hat with the left foot, play the right hand part on the ride cymbal instead. Here are some examples.