Dude I really don't like the 6 day split training each body part twice a week you will end up over training the vast majority of the time. The guys you hear about that train each body part twice a week are on a ton of drugs and I am assuming you not, but moving past that I would strongly recommend doing a 5 day split in which you work each muscle part once and work some of your smaller muscles twice. An example of this would be doing chest, tri's and calfs on day one, back bi's and forearms on day 2, legs (quads gluts and hams) on day 3, shoulders and tris and calfs on day 4 then resting on day 5. After that you can start the split over or take another day off then start...its really up to you but by doing this split you aren't going to run the risk of over training your muscles into the ground. Also if your like me and hate taking a day off from the gym this will allow you to still train 6 days a week (most weeks) and not burn out. And when your training make sure that your are doing mostly multi-joint movements like bench, pull-ups, squats, dead-lifts, military press, narrow grip bench press (the list goes on). I hope it helps man