You have to watch this video of the Mod TC's going down the back straight. Turn up the volume on your PC and hear the "swoosh".
Worlds Warm-Up Back Stretch Part 1:
https://www.facebook.com/photo.php?v=448438288623567
Worlds Warm-Up Back Stretch Part 2:
https://www.facebook.com/photo.php?v=448439258623470