[music] Now let's try the travelling undulation. What you're going to do is combine the basic undulation with some foot work. So when we contract our upper back to reach the chest up we are going to step on the right foot, as you contract the upper abs you are going to step on the left foot. Stepping right lift up, dropping down step left: and right, and left, and right, and left, right,and left, and right, and left. And when you get comfortable connecting those two movements start to add the belly contraction, reaching up, contracting, contracting, reaching up, contracting, contracting. And this movement is easier to do when you come up on your toes. So, you're going to step right - reaching the chest up, step left - reaching chest back, up - chest down, and up - chest down. Let's try that with music. [music playing] And let's try a little bit faster. [music playing] And you can take this move to travel from side to side. Additionally you can change the footwork so you step left - right -left -right. You can bend the knees and lift up to add a little change. And that's how you travel with an undulation.