The primary difference between class levels is not the poses. You get a few fancy new ones as you gain flexibility, but those are icing on the cake. Probably 9

The primary difference between class levels is not the poses. You get a few fancy new ones as you gain flexibility, but those are icing on the cake. Probably 90% of what you do in any given class is the same. The primary differences between a beginner class and an advanced class are the frequency (repetition), rest time and hold times used. Advanced classes will easily work 2-3x more asanas into an hour than beginner classes.