Look at how DC is structured. you have 2 workout days (chest/shoulders/tris/back width/back thickness and bis/forearms/calves/hams/quads) but 3 separate sets of exercises for each. So you only repeat a given exercise every 12 days. For instance tomorrow for chest is decline BB, in 4 days it will be incline bb, then 4 days later flat bb, then 4 days after decline BB again. your body never really adjusts to it, I haven't seen a plateau yet.