What is a requirement for skaters during the synchronous spin element?

During the synchronous spin element, the key requirement is that a feature must be executed simultaneously by the required number of skaters. This element is crucial for demonstrating the team's unity and timing, which are fundamental aspects of synchro skating. The effectiveness of the synchronous spin is measured not only by the technical proficiency of each skater but also by how harmoniously they perform the spin together.

This requires a coordinated effort where the spin itself—be it in position, speed, or rotation—is executed by the designated number of skaters at the same time. The achievement of synchronized movement enhances the overall visual impact of the performance, showcasing the team's ability to work as one cohesive unit.

In contrast, the other options either misinterpret the necessity of synchronization or focus on individual variation, which is not applicable to this specific element of synchronized skating. The essence of this discipline rests on the synchronized execution of moves, hence making simultaneous execution essential during the spin.