(CNN)Seasoned yoga instructor Mariza Smith has a confession.
"Nobody wants to see the inside of what's happening in your shorts," Smith told CNN. "You do see a lot of that in yoga classes."
Yoga's popularity, which has almost doubled in the past 10 years in the U.S., evidently has its downside, ushering in a rash of newbies unaware of the teaching's finicky (and often justified) unwritten rules.
Celebrity yoga devotees such as Jennifer Aniston and Gisele Bündchen have opened up a whole new market, attracting many who are perhaps more interested in buff bods than spiritual growth.
To be fair, attending a yoga class for the first time can be a hugely daunting experience. Yogis can dress strangely (or scantily), they can make funny noises, they sometimes smell awkwardly, and twist themselves up like pretzels or flip into a handstand just to warm up.
In an effort to soften the eye-opening introduction into the yoga world, Smith, along with veteran London-based teachers Leila Sadeghee and Norman Blair, break out the 10 types you are likely to encounter in a yoga studio:
1. The yoga strutter
"There are a lot of yoga strutters in this world (who) strut in literally like peacocks," says Smith, who began practicing in 1995 before training in Mysore, India and qualifying as an instructor in 2008.
"And they're like, actually I can do the more difficult variations so that I'm just going to show you how good I am. That's when it's frustrating."
"I have seen it where the version of what is being taught and a version of what a student is doing is so different that it can actually be distracting to others," explains Sadeghee, who suspects that the yoga strutter attends class for "an energetic crutch," rather than a structured routine.
"It is very supportive to practice in a group, but then t