What is the point deduction for a lack of a turn on one foot?

When judging gymnastics, the deduction for a lack of a turn on one foot is set at 0.20 points. This deduction reflects the importance of executing a turn on one foot as part of the required elements in a routine. A turn on one foot demonstrates balance, control, and the gymnast's ability to perform complex skills, which are essential criteria for level 9 routines.

Furthermore, the specific value of 0.20 points was determined by the governing bodies in gymnastics to ensure consistency in scoring and to encourage gymnasts to fulfill all required elements satisfactorily. This emphasizes not only the skill set needed to perform the turn but also contributes to the overall artistic impression of the routine. The other options reflect smaller deductions which would not accurately represent the significance of executing this particular skill.