Ryggen
Från Polkagriswiki
quadratus lumborum.
http://saveyourself.ca/articles/perfect-spots/spot-02.php
http://saveyourself.ca/tutorials/low-back-pain.php
http://www.youtube.com/watch?v=Tm1QxM9lehY&feature=related - Sidplankan. Bra grejor.
http://www.youtube.com/watch?v=f0ZT8zlv-iM&feature=related - Sidplankan advanced me rotation.