What is the penalty for executing extra arm swings during the landing phase?

The penalty for executing extra arm swings during the landing phase is indeed up to 0.1. This deduction is considered because additional arm swings indicate a lack of control and stability upon landing. In gymnastics, maintaining balance and proper form during the landing is essential, and any extra movements can detract from the overall performance quality. The judges assess these extra movements and apply deductions accordingly, emphasizing the importance of a clean and controlled finish. Therefore, a deduction of up to 0.1 is appropriate in this context, reflecting the minor nature of the infraction.