I can see how the mental game comes in bigtime especially when the %'s are up there on week 4 after you think you just pushed yourself on 3 reps then 2 and that last 1 rep set you need to dig deep and also not getting lazy and losing form. Alot of mental in this
Yes, this routine takes a lot of mental fortitude. You have to be really focused when you training. 100% focused. You can't let your mind wonder and also you have to be able to tell yourself and believe that you can perform the numbers you're instructed to. This can be hard at times when you've been doing this for a long period and the numbers seem outrageous. Just remember to trust the program and believe you can lift the weight, not matter how high it may be.

This def isn't a beginner program. It's more like an advanced program. I would say this is even more challenging than intermediate programs I've seen.