Final answer:
The teacher's adaptation to keep her class engaged is called active participation. This approach helps improve students' focus and participation in the classroom.
Step-by-step explanation:
The teacher's adaptation to keep her class engaged is called active participation. By leading the children in a group stretching activity and giving them a choice to choose another area to play in or sit and continue hearing the story, the teacher is encouraging the students to actively engage with the lesson instead of being passive listeners. This approach helps improve their focus and participation in the classroom.