Becoming a proficient slalom water skier takes some practice, but slalom skiers say their sport is one of the most enjoyable ones on the water. The best slalom water skiers ski on one ski, but when learning how to ski it is best to start with both skis. Once the skier can ski with two skis, they can try the slalom. And once they are comfortable with the slalom, they can begin practicing to slalom ski on one ski.