On our tryout day for preteam/team the kids dont have to even be in the gym recreationally - they will take anyone - advertise at schools etc. - he wants to find athletically talented kids before they are snatched up by another sport!
They have a series of 'tests' to do (maybe 10 - 15?) and coaches or helpers to score each child on the test.
They attempt various things to do with strength and coordination and courage and a general comment may be made too.
I have helped here, and they do stuff like running races, including through the pits, leg lifts on wall bars, attempt a lever, touch toes, standing broad jump, attempt a rope climb, jump off a height into the pits (like a backward fall with their arms crossed over their chest from the height of the bar), etc
The head coach is there, and after the scores are added up (while they kids have 'playtime' in the gym) he talks to the helpers about x or y specific kid he maybe wants more info about - how did they do this that or the other.
Then he meets with the parents in the lobby and hands out a letter of invitation to try 8 free classes for the ones that he likes the look of - after this they get an official invitation, and start paying! Some obviously do not get asked to stay after the free classes.