Here's a recent interview of Brain Johnston, it was on listening to this that i really got my eyes opened too hypertrophy specific training.... http://www.highintensitynation.com/
In H.I.T, there is too much focus on becoming stronger (for bodybuilding purposes), yes progressive overload is important, however its only one part of the puzzle. The fact that one is getting stronger, does not necessarily mean one is progressing in terms of hypertrophy. The body learns to cope with more an more resistance, its intra-muscular coordination, neuromuscular adaptation, and you simple become more skilled at the activity. There is even a shifting of tension within the muscles, just so that the body doesn't have to produce hypertrophy, reason being, muscle is a metabolically expensive tissue and the body will do what it can not to produce more and more muscle.
Brains techniques (which are still H.I.T based) produce more of a bodybuilding effect, zone training and 1 1/4 reps produce more contraction's per unit of time, consistent tension thoughtout the entire rep (superior to a traditionally preformed reps, as traditionally preformed reps all have sticking points), the cluster sets, is a rest pause method that produce's more cumulative fatigue within the muscles that really extenuates the pump.
I also dont actually have a set routine or training schedule, i change it from week to week, firstly to better manage stress, secondly i feel its important to vary everything as the body adapts really quickly, and when it does, it becomes more reluctant to change. So for example, one week i'll train 3 days in a row, followed by 4 days off, the following week i might train mon / wed / fri, the next week maybe i'll train just two days, the following week i take a layoff etc. The exercises i mix up from workout to workout, i change the techniques from week to week, i even introduce new foods into my diet every week so as to keep the body from adapting, its my belief that if you eat the same foods all the time the body may become sensitive too them.
People ask me, "well Rob, how are you able to track your progress if your changing your routine all the time", my reply " there is nothing "routine" about my training, but, since you ask, i use the mirror, monthly bodyfat check-ups, and how my clothes fit to measure progress". I do get were their coming from though, some individuals need structure, for example, structure is a requirement if strength training / powerlifting is your focus, as your looking to improve upon a specific function, and the only way to get better at that specific function is through practice.
If you'd like to know more about zone training, cluster sets or 1/ 1/4 reps just give me a shout mate, i'd be happy to elaborate on them:)