Our apologies for interrupting your competitive exercise session (i.e. your Crossfit WOD).
Mobility - a bs term not even listed in Wikipedia for fitness but written by broscience on the internet and presented at "seminars" by d-bags.
There is flexibility. There is range of motion. Mobility as a word means movement.
Do you move? Awesome. Want to move better for a specific goal? Good. Good for you.
You want to be a mobility functional trainer? Memorize this chart. Then kill yourself. Painfully.
This picture has the origin of who generated this hilarious flow chart. It's hilarious because it was an intentional joke. And it's funnier, because mobility coaches are terrible human beings.