Exactly!
Can we please agree that the topic here is strength training?

For neurological clients, overloading 1RM with one set of 5-8 contractions has been shown to be most efficient for strength training. Don't know what research for musculoskeletal strentgh training says.
How you do that for which of the gluts is up to which level the client is at.
The first comment related to an apparently already quite fit person, so bridging won't cut it.

Bridging is nothing else but a functional exercise to aid bed transfers and mobility. And yes, we do use it for functional purposes and building up postural control, but it is absolutely unreliable for strength building, as you can quite easily compensate for any weakness. Good luck if you believe you can "see" and correct this in a client.
I prefer sidelying or prone myself and have copied some of the Pilates style exercises.

Cheers,
Fyzzio