When Clijsters was five years old, her father built a clay tennis court at their home as a gift to his daughter to celebrate him winning the 1988 "Gouden Schoen", an award given to the player of the year in the Belgian First Division. He had previously announced the idea of the gift as a celebration of the award during a television interview. Clijsters began playing tennis earlier that year after attending a lesson with her cousins and her uncle while her parents were away. From then on, she became fixated on the sport. She began playing with her sister at the Tennisdel club in Genk by the time she was seven. Her first coach Bart Van Kerckhoven recalled that she was extremely energetic and never wanted to leave the tennis court, adding that, "If the group before her did some sprints to finish off the session, Kim would join in. Then she put her heart and soul into her own training session, after which she joined the next group for their warm-up exercises."