In the International School of Ballroom Dance, the basic pattern involves the lead (usually the man) taking a checked forward step with the left foot, retaining some weight on the right foot. The knee of the right leg must stay bent and close to the back of the left knee, the left leg having straightened just prior to receiving part weight. This step is taken on the second beat of the bar. Full weight is returned to the right leg on the second step (beat three).