| 16 sets for back. I would tone it down a bit, either alternate pullups every other week with the pulldowns or tone it back to 3 sets pullups last set to failure and 3 sets of pulldowns.
I am not sure how many sets of pullups you are getting on your sets with the 50 reps. I would also keep the pullups and pulldowns in front of the head as behind the neck can promote rotator problems especially when done heavy.
Legs are good but you are only doing 12 sets on legs which are the most used muscle on the body (supporting your weight) and like 20 sets for shoulders. If you are only going to do 12 sets then I would recommend doing squats. The best legs I have ever seen the guy only did deep squats only for quad. Quite impressive his legs were.
If you are going to do leg press then I would add a hack squat in there. Arms, I will comment on later.
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Scott
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