Why a six pack doesn't always mean core strengthTo play this video you need to enable JavaScript in your browser.This video can not be playedWhy a six pack doesn't always mean core strengthCloseListen to the full episode on BBC Sounds.SubsectionHealthPublished9 JulyShareclose panelShare pageCopy linkAbout sharingRelated topicsFitnessFollow Fitnessclose panelYou are now following FitnessUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description