I think this is the general reason why it's frowned upon.
Some instructors don't like their 'secrets' or go to moves being widely shared around. I could be wrong though.
One problem I have is that I work shifts, so have to go where I can when I can.
I do like to train at various different places though as you learn a lot more by rolling/sparring with different people, but I always feel like I'm offending the instructors when I do this.






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