Which of the following is NOT a type of error for one-foot or two-foot turns?

The identification of "executed on a circular path" as not being a type of error for one-foot or two-foot turns is based on the principle that a circular path is often necessary and intentional in the context of performing these turns correctly. In synchro skating, turns are frequently executed with a curved/pathway, as that aligns with maintaining flow and rhythm within the routine. Using a circular path enhances the overall aesthetic and technical quality of a performance, allowing skaters to effectively connect transitions and maintain alignment within the team.

In contrast, the other options represent specific errors that can detract from turn execution. For example, a two-foot entry or exit signifies a lack of control or proper technique when entering or leaving the turn, which should ideally be executed on one foot for advanced synchronization. Similarly, if the free foot touches down during the turn, it disrupts balance and flow, and jumping during a turn indicates a significant loss of control and technique. Each of these errors impacts the skater's ability to perform turns effectively and seamlessly, thus differentiating them from the necessity of executing turns on a circular path.