There are many variations on this simple and fun hip-hop move. As you step with the right foot, pop the shoulders up-down (count 1&) and repeat while stepping on the left foot (2&), continuing through 8 counts. Then have the dancers reverse the shoulder movement (pop down-up) as they step, and try it stepping backward as well. Now step it up by alternating shoulders right-left (1&2&3&, etc.) while stepping right-left on 1-2-3, etc.
Add footwork beyond the basic walking step to the shoulder work. While bouncing the shoulders in any variation, add popping up to both heels at the same time. Make it more complex by popping up to the right heel (foot turned out) and the ball of the left foot (turned in). Reverse to the left heel turned out and the ball of the right foot turned in. Alternate for a full 8 counts. Stress that the movement should be clean but not too stiff; you want it to look funky!