I appreciate the help guys.
I think it's more psychological for me to want to do a day solely on arms, I'm too used to it and not sure if how I'd feel giving them up. The benefit of leaving them to last though is I can see how they feel by Friday and maybe then I'd feel better leaving them out, as in they've had a good enough work out already.
I'm guilty of being an isolation lifter if I'm honest, so incorporating some exercises into this routine, at least initially will be important to me, if maybe after 2 weeks I'm either exhausted or satisfied that they're not needed I'll drop them for the last 2 weeks.
I did do shoulders today, had a good sweat by the end although had to find my weight at times so may have a lost some effectiveness.
Just out of curiousity, I'm a low carb guy, not a diet a lifestyle I keep to under 50g carbs during the week with 1 re-feed and 1 carb up day a week, it's helped shed body fat and I'm used to it. Do any of you keep a low carb diet doing methods like this without over-fatigue?
Thanks again guys.