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Build intraabdominal pressure creating greater structural integrity much like the can of pop. 

This exercise can help expose an imbalance as well as help restore even tensions between sides. 

If the portion of the sling containing the abdominal obliques is weak or slack, other sections of the line need to take up that slack.

Think of these muscles like a brake controller.  The opposing tension helps create space easing the joint into place as it moves.