hip bridge

This isn't trolling about a favorite Dan John exercise, honestly. I'm just curious what others think of it and if this is one of those exercises that's worth adding into the movement template. I am completely neutral on it.

I'm curious about this move; usually when I see it demonstrated the knees are apart, with or without a band, emphasizing abduction. I remember the book saying that the reason was to prevent hyperextension of the back but I can't help but suspect there are other reasons it was selected - perhaps...