Totally depends on the group, my usual classes are in German but if someone only speaks English I switch to English as it’s the most common language that anyone can understand :)

Not at all. My Classes are suitable for beginners and intermediate. If you come to studio classes, please read the description of the class beforehand, some classes are Level 2 only.

My Retreats are mostly for all Levels, if I ever plan a Level 2 Retreat, it’s going to be in the information about the Retreat.

Bring something to hydrate during the class & come in sports clothes with which you can move easily

Other than that, be open to the experience :)