What must skaters aim for while changing spots or center within a spin?

Skaters must aim for continuous movement and momentum when changing spots or center within a spin because maintaining fluidity is crucial for the overall quality of the spin. Continuous movement helps to keep the rotational energy going, which is essential as it allows skaters to execute transitions smoothly without losing balance or control. Momentum is key during these movements, as it aids in sustaining the spin's speed and stability.

When skaters focus on keeping their movements continuous, it ultimately enhances the aesthetic appeal of their performance, contributing to higher scores in competitions. Other considerations like direction changes, speed, or performing solo spins do not support the priority of maintaining fluidity and balance during changes in the spin. Therefore, the emphasis on continuous movement and momentum aligns with the execution standards required in synchro skating.