Some will change depending on the skills, movements you are doing for that day.
If you have restrictions somewhere you would always be hitting those areas probably before the group warm up to be sure it is covered.
inch worms w/push up
lunges/oh head lunges no weight
short run, row, airdyne, or assault bike
are a few to hit.
Episode 339: MWod and Warmup: Olympic Lifting
Warm Up: Brian MacKenzie Running Warm Up
Warm Up: Erin Cafaro-Rowing (Olympic Gold Medalish)