I don't know enough about the discipline. I'm assuming the people in the warm-up area know what the pattern is?
But, apart from that...
Why does a dog/handler team need to "warm up" prior to running in the Ob. ring? Do they need to warm up muscles or something? I don't know a lot about it, but it would not seem to me that that would be the case. (Maybe with vigorous jumps and stuff, but not with the basic ring. Am I right?)
I'm curious because in Field sports there is absolutely no "training" on the grounds and no "training equipment" and in a lot of grounds, you can't even take a dog to air off-lead. No bumpers, "no heel-sit-mark-etc." So... there really is no "warm up", especially as it relates to particular skills. You kinda run the dog with whatever the two of you have brought to the game that day. It is what it is.
Tell me what they are doing in the "warm up" area?