Good post!
It keeps popping into my head every time I see a girl doing any the moves described here during the course of a catfight or wrestling match ... which seems to happen quite often!
Eg, applying a scissor hold with any force would certainly bring the core and pelvic muscles into play. So would twisting, turning and bridging to try and escape from a scissor or school girl pin.
Maybe this is one of the reasons why so many straight females seem to get a sexual kick from fighting, whether they win or lose.