Final answer:
In a Princess Posture class, girls learn about body alignment, posture, and grace, as well as exercises to strengthen core muscles and improve flexibility.
Step-by-step explanation:
In a Princess Posture class, the girls would likely learn about proper body alignment, posture, and grace. They would be taught to sit and stand with poise, hold their heads up high, and move with elegance. The class may also include exercises to strengthen the core muscles and improve flexibility.