[OldGuy]

It seems that your reading comprehension gets a FAIL

Originally Posted by AskTheTrainer

The results of a study mean ABSOLUTELY NOTHING without extensive knowledge of the test subjects. The subjects of the mentioned studies were back pain patients? senior citizens? professional athletes? Children? athletes? sedentary adults.

Paragraphs 1 and 2 tell about research done in the 90's on people with healthy and unhealthy backs and how that research have lead trainers and trainees to define "core" as the abdominal muscles.

Originally Posted by from the article

“There’s so much mythology out there about the core,” maintains Stuart McGill, a highly regarded professor of spine biomechanics at the University of Waterloo in Canada and a back-pain clinician who has been crusading against ab exercises that require hollowing your belly. “The idea has reached trainers and through them the public that the core means only the abs. There’s no science behind that idea.”

Originally Posted by AskTheTrainer?

You cannot mention anything about the core without talking about the posture (A position of the body or of body parts) which is unique from person to person. Posture is influenced over time by the muscle balance of the associated muscles. (i.e. tight hip flexors causing anterior pelvic tilt and weak glutes which is present in the majority of the population).

Originally Posted by from the article

But, McGill says, the muscles forming the core must be balanced to allow the spine to bear large loads. If you concentrate on strengthening only one set of muscles within the core, you can destabilize your spine by pulling it out of alignment.

I don't know, it seems to me he is talking about muscle balance there.

Originally Posted by AskTheTrainer (NOT)

An article titled "Core Myths" [Core myths for who?] leaves the reader to conclude that everything out there is wrong, buy Dr. McGill's books & DVDs.

I didn't see any mention of Dr. McGill's books or DVDs in the article at all. But I wouldn't recommend them for you. This article was too difficult for you -imagine how hard the books must be.