Simple

A pair of simples, left then right: 1- step forwards onto the toes of your left foot, raising your body, and bringing your left shoulder (and the whole left side of your body) a little forwards, 2-3 slowly bring your right foot forwards, until it is poised in front of your left, ready to take the next step, while you slowly lower your left heel; you might also (on 3) begin to "straighten up" your shoudlers. 4 - step onto the toes of your right foot, raising your body, and bringing your right shoudler forwards, 5-6, slowly bring your left foot forwards, while lowering your right heel, and beginning to "straighten up" your shoulders.

Note: a pair of simples counts as two steps, so for each step you rise and fall, and for each step you lead with a different shoulder.