heres tip for back training:
if you doing deadlifts(for the back, which means you bend you knees) bring them down to your shins but dont touch the ground(look at dorians "blood and guts" in the back training part if you want to see a visual). it becomes a totally diffrent movement as the stress is constant. Your back becomes so insanely pumped its crazy. you feel the lats, rhomboids,traps, lower back, everything pulling and contracting. its nothing like a regular deadlift(where you touched the ground, wait, then pull up again). I personally perfer these over regular deadlifts.