I completed 4 weightlifing sessions and 4 cardio sessions. A good week. To complete my 4 day workout split, I have to work out two consecutive days in a row once a week. I usually work upper body on day 1, and legs on day 2. I was pretty wiped out after last week's consecutive days of working out. I have to do a better job of getting more sleep and/or naps on the two days that I decide to work out consecutively.
I am pleased with the results of my arm workouts. At this point, I am not putting bulk on my arms. Instead, the definition of my arms now looks better than it has in the past. So, my 4 day split seems to be working for my arms.