Drop-in classes are the most common one for hobbyists, you can sign up and walk-in to these classes whenever you want to, without any commitment.
A specific time and date that people can sign up to and train on their own in a shared space/rigs amongst others training on their own.
Short structural and progressive courses that students have to sign up to for a specific period or term, usually a number of weeks.
They have availability for people to hire an entire or a section of the training space to their own, not sharing with others.
One-off and non-regular workshops, usually taught by visiting teachers and coaches.
Classes, courses or workshops that specifically target children or teenagers.