What deduction occurs if a gymnast fails to pass through vertical during a back extension roll at Level 4?

In the context of judging Level 4 gymnastics routines, not achieving a vertical position during a back extension roll results in a deduction of up to 0.30. This is because passing through the vertical position is considered a fundamental part of the skill, essential for demonstrating control and proper execution. If a gymnast does not reach vertical, it indicates a lack of alignment and potentially affects the overall quality of the performance. The specific deduction reflects the importance of this position in demonstrating proficiency in the skill. Maintaining vertical is critical not only for the aesthetic aspect of the movement but also in showing the judges that the gymnast has mastered the necessary technique, and the deductions reflect the repercussions of any errors in achieving that vertical orientation.