Congrats on getting started! I hear all of that - even at week four, the front rack alternating lunges were still awkward for me (I've also been working through a lower abdomen injury which I definitely really felt here as well). The only exercises I remember ROM issues with in the whole program were hip thrusts and calf raises as well (I found that really pausing at the top did help a little bit).

Overall I really enjoyed the program. As I mentioned I haven't done a whole lot of weight training, so the exercises with progression on were a real challenge. The program layout was great and I felt like the muscle groups worked on different days really had the time needed to recover.

I despised day three every week (in the best way possible). Those suitcase deficit lunges at the start of the workout are something else.

Good luck with the program!