You can actually train for a long time and fail to get six packs; while someone else can train for hours and get them. It is all about how you train and the devotion to the training sessions. First you need to check on your nutrition, the right exercise program and you should also be disciplined. You can get six packs by doing sit ups, leg lifts and static holds or by doing crunches. You can visit http://www.menshealth.co.uk/building-muscle/abs-workout/ or http://howtogetasixpacknow.org/ for more information.