Some depends on what you are doing for mobility.
Some MWods should not be done before a workout. These are noted in the video.
New range is messy range.
If it is a restriction that you’ve had for some time it may take some time for you to hold the changes.
You may need multiple mobility sessions during the day in the beginning. The time you are able to hold the changes will increase as your body learns the new positioning.
A 10 minute squat test should be done at a completely different time.
After a workout you are tired and this can impact it.
These should not be done prior to a workout.
From the FAQ When should I do the MWOD