Teaching someone to dive can be challenging, as the students can injure themself if they haven't mastered the proper form. Demonstrating the diving stance on land and showing them a kneeling dive can help a swimmer get comfortable with diving into the water headfirst. You can then move on to teaching them a standing dive so they learn the correct form. Instructors always have to stay close to the swimmer as students learn how to dive so they can assist them as needed.