Gym language
Drop-in
Also called a walk-in or a single session
What it means
Paying for one session rather than a week or a month. Most camps allow it, and it is the only reliable way to find out what a place is like before committing.
A camp that will not let you drop in before you buy a month is telling you something, and it is worth listening.
Two drop-ins at two camps in your first days will teach you more about fit than any amount of reading, this site included.