1. Morphology: The action of the rocker arm is mainly the natural swing of the arm along with the dancer's body movement, and the hand is mainly the natural continuous action, while hot wheels is a skill that uses the axle to twist the arm and wrist through twisting, turning and shaking.

2. Action content: The rocker arm is usually the dancer's arm, focusing on the dancer's posture, body posture and the movements of fingers and palms, while hot wheels relies on the arms, axles, waist and other parts to emphasize the coordination and continuity of the overall action.