Is not changing one's sitting position after the prayer specific to those praying behind the imam?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: It is established that it is a sunnah (recommended practice) not to change one's sitting position until one says ten times, "There is no god but Allah alone, having no partner," after the Maghrib prayer and after the Fajr prayer. The question is: Is this specific to those praying behind the imam, meaning changing the sitting position?

Answer:
It is better to place one foot under the other. It came in the hadith that he places one foot under the other, so this is better. If his feet hurt and he cannot do it, there is no harm. But if he is able to do it and it does not burden him, then this is better.