Cuban Motion in One Short Lesson by Joe Baker.

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1. "Shaking or twisting the hips."
The hips should move up and down naturally as a the knees are bend and straighten alternatively.

2. "Tilting the upper body back and forth like an inverted pendulum."

The shoulders should stay steady and stay virtually at the same  level during the dance.
 

3."Not getting the hip action."

Shuffling legs instead of bending the knees, properly placing inside edge of ball of the feet, and complete weight changes with each step.

REFERENCE:Cuban Motion in One Short Lesson by Joe Baker.The dance Store Online. Merengue: Merengue information, tips, free dance videos and music MERENGUE DANCING, BAILANDO MERENGUE (RONALD AND RUPAL)