Back to Course PROTECT YOUR BACK WORKOUT CEC 0% Complete 0/0 Steps Introduction CEC How the Core Spine Works CEC How to Brace Your Core CEC Phase I CEC Phase II A CEC Phase II B CEC Warm Up CEC Cool Down CEC Back Breakers CEC PROTECT YOUR BACK WORKOUT CEC How the Core Spine Works CEC Lesson 2 of9 In Progress ← Previous Next→ How the Core Spine Works CEC <span style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" data-mce-type="bookmark" class="mce_SELRES_start"></span>