What is required for choreographic requirements in linear and rotating elements?

For choreographic requirements in linear and rotating elements, it is essential that a feature must be executed at the same time by all team members. This synchronization is fundamental in creating a cohesive visual effect, which is a hallmark of synchro skating. When all skaters participate in a specific move concurrently, it enhances the overall illusion of unity and coordination, showcasing the team's skill and synchronicity.

Executing elements simultaneously also contributes to the complexity and difficulty of the performance, which plays a significant role in scoring and evaluation during competitions. Judges look for this synchronization to assess the team's ability to work together as one unit, demonstrating precise timing and control.

The other options do not align with the core principles of synchro skating. Requiring features to be executed at different times, involving all skaters, or allowing only one team member to perform does not fulfill the essential criteria for linear and rotating elements, where simultaneous execution is key.