In the doughnut/ring position, what feature is essential for the upper body?

In the doughnut/ring position, the essential feature for the upper body is that it must be arched back. This posture is crucial as it helps skaters maintain balance and stability while creating the desired shape of the formation. By arching the back, the skater can align their body in a way that promotes effective control through the core, which is vital for holding the position and facilitating movement within the ring formation.

A proper arch in the upper body also enhances the overall visual appeal of the performance, contributing to the aesthetic quality that judges evaluate in synchro skating. It allows for an elegant line that connects the upper body to the lower body, ensuring that the skaters can execute their maneuvers smoothly while staying connected to one another. This attention to body alignment not only supports the technical aspects but also elevates the artistic expression of the team's routine.