I have also strategically been adding to the routine. I just want to make it clear that I never make a firm plan to do something. I might plan ahead and based on how I feel I'll change or terminate my workout if I'm not feeling up to it. Less is always more so I never force myself to do the additional work, only if I feel 100% up to it.
This is how I plan on setting up my next 6 week cycle
1 - Isolation Circuits and Core Blitz
2 - Strength Circuit
3 - 3rd Day for Upper/Lower Body Press
4 - Isolation Circuits and Core Blitz
5 - Strength Circuit
6 - 3rd Day for Upper/Lower Body Press
This would add up to being: 2 weeks of Core Blitz, 2 weeks of Optional Strength and 2 weeks of Option Isolation Circuits, with a 3rd day for Pressing if I'm feeling up to it.
Weeks 1 and 4 - I don't plan on changing my main exercises so there is zero adjustment to be made here. Since there is a very low amount of volume both these weeks I'm going to so Isolation Circuits over strength circuits. Once again reason being that this is probably the only time I can logically add isolation work until I build my tolerance up for volume. I'm also going to throw in the Core Blitz as well
Weeks 2 and 5 - So far I have found these weeks to be the hardest. I don't see myself doing anything else but what is required but on any given day if I'm feeling good after the main lifts I'll be throwing in a Strength Circuit using the same lifts from the workout.
Weeks 3 and 6 - During these weeks if I perform well and am feeling good I'm going to push for a 3rd day for both Upper and Lower body pressing. So I would end up doing Mon-Wed Upper body Pressing, Thurs, Fri and Sunday Lower body Pressing. This is one scenario that will most likely not happen I tend to play on the safe side when it comes to sparing my nervous system.