Warmup Maps (custom)

I was watching twitch the other day and I stumbled across a team of 4 warming up. They were playing on a flat map and respawned with snipers and magnums and it was capture the flag. I’ve been trying to remember the gamer tags of those players but I just can’t.

Anyone have any good warmup maps/know of any that are similar? Or unique that work for you and your team?

I appreciate any input!! Cheers!