These are new teachers who have graduated from one of the many teacher training courses that Yoga studios offer. The course will last for 4 weekends in a month. They will have graduated this course and might have even practiced Yoga for a couple of years.
The Very Clueless
Same as above, but they have taken the Express version of the course that is held for two weekends in the month. You pray they have some Yoga under their belts.
The Extremely Clueless
Same as above but have taken the weekend teacher training course and probably exaggerate about how much Yoga they have done. Your only line of defense is to completely ignore them, do nothing they say to do. If you make the mistake of following their instruction be prepared to get injured.
TIP: It is always a good idea to make sure your health insurance is current before taking a Yoga class with the Extremely Clueless.