1, stretching muscles: The aerobics instructor puts his hand on his head to show the preparation before the activity and stretch the muscles. Doing so can play a warm-up role.

2. Enhance overall strength: The aerobics instructor puts his hands on his head, which means that the muscles and overall strength of people who strengthen their arms and arms can be more energetic.

3. Head movements: The aerobics instructor puts his hand on his head to show the head movements in aerobics, which is convenient for other follow-up movements.