Detailed case of "whose posture is correct" in large class health quality class

Let children know that incorrect posture of sitting, standing, walking and reading will endanger their health. Whose posture is correct? Activity goal: 1. You should know that incorrect posture of sitting, standing, walking and reading will do harm to your health. 2. Understand the main functions of human ribs and spine bones, and know how to protect the health of bones. 3. Gradually develop the correct posture of sitting, standing, walking and reading. Activity preparation: The key and difficult point of the flip chart activity is to develop the correct posture of sitting, standing, walking and reading.