When doing the chest/back and limping workouts at the same time did anyone add a fifth workout for arms? Do you think it is necessary?
I don’t think it’s necessary. What I did was I added a few extra sets of arms after each of the upperbody workout days. For example, where the workout called for 2 sets of Hammer Preacher Curls for 6-8 reps, I would add in 2 sets of triceps extensions and vice versa. I wouldn’t worry to much about losing any size in your arms. My arms actually may have gotten bigger. Try it out, you will realize that your arms are getting plenty of ancillary work.
Your arms should get enough work from the exercises already contained in the program. However, I would look to add calf work and ab work.
Hope that helps.