I'm interested in taking a martial arts class, do I need to be physically fit?

Anonymous
I'm really not physically fit at all, but I kind of want to take a martial arts class or some sort of self defense class. Is it a bad idea to take one without trying to get into shape first? Will I look like an idiot since I am not in shape and have no prior training? (I'm 18)
Updates
+1 y
Is there anything I should start doing in preparation?
I'm interested in taking a martial arts class, do I need to be physically fit?
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