humberto? ♪ he's dancing to -- >> the tune in his head? >> here's the cool part.here because jason derulo had a special surprise for them. he walks through the door and surprises all of them, because it is now time to see if they were all paying attention. >> exactly. you best hope you learned the choreography because the fella is in front of him. ♪ hold tight when you tiptoe >> now jason did partner with zumba to create the official zumba choreography for their classes so all the 15 million zumba fans all over the world can sign up for a class and learn the dance getting a workout. zumba caught up with jason to get the scoop. >> want to feel like it's a party down there, not necessarily working out. >> let's check in with our homie and see how he's doing. his best move is his best one, he finds a stool and decides it sit it right there. >> me, the self-admitted nondancer i'm thinking those steps all you're doing is going. ♪ da, da, da, da lean >> all right, gayle. >> you know, you just do this, lean, lean. >> gayle, if you think it's that easy, jason has a messag