As per your request, my updated training program.
Day 1: Back and chest
Day 2: Arms
Day 3: Legs
Day 4: Rest
Repaet
Rest is after leg day and not back and chest, legs, arms, rest as this is the most demanding workout in temrs of the cns and requires the best recovery.
Cardio: one intervals session and one zone two/short sprints. Not on a certain day, decided by fatigue.
Mobility: 3-4 times a week, different target joints and muscles each, of course set by the workouts done on the same day (changes as the workout plan is in 4 day cycles and not weekly) Also training of performance under fatigue on leg day.
Let me know if you have any questions or if something does'nt make sense to you.