How do you do colorguard extensions (figure 8's)?

Tryouts for colorguard are in may, but I want to practice before then. Pretty much I have to know how to do drop spins and extensions. If anybody could break'down the steps I'd appreciate it.How do you do colorguard extensions (figure 8's)?
I think I know what you're talking about. We call them carves. Basically you bring the hand on the bottom stopper in to your bellybutton and keep your other hand on the tape and up at a 45 and circle it around so that it then goes down to a bottom 45. kind of like you are making an hourglass with your flag.