How much is deducted for performing a piked backward roll instead of the correct movement in the back extension roll to kneel pose?

The deduction for performing a piked backward roll instead of the correct back extension roll to kneel pose is correctly identified as 0.40. This is due to the fact that the piked backward roll significantly deviates from the required skill, which involves a specific body position and movement pattern. In gymnastics judging, significant errors in execution or incorrect skills that do not meet the criteria of the routine usually incur higher deductions.

In this case, a 0.40 deduction reflects a notable failure to perform the required element as described in the routine guidelines. Performers are expected to demonstrate skill proficiency, technique, and a clear understanding of the prescribed movements; failing to achieve this with a major deviation like performing a piked backward roll indicates a substantial error in the execution of the skill. Each level of deduction corresponds to the severity of the error, and in this situation, 0.40 is the appropriate deduction for such a significant departure from the expected performance.