I followed the last link in the article (on weak back extensors) and found a hel...

		jdnier on Dec 30, 2015 \| parent \| context \| favorite \| on: Posture Affects Standing, and Not Just the Physica... I followed the last link in the article (on weak back extensors) and found a helpful exercise video to recommend to my backpack-slogging teenage son. https://www.youtube.com/watch?v=EKD2kKa_ME0