I have had some trouble getting a good shoulder work out. I do seem to be getting some results as far as increase in strength, but I have never gotten my side or rear delts sore. I do a four part split. I have been lifting 3-4 times a week for 14 months. I do a fare amount of work over my head at my job, and have wondered if that has some effect. I start my shoulders with side straight arm laterals one set of 14 and one set 12 for worm ups. Two sets of 10. 15,20,25lbs and some times 30lbs. at 8 reps for the last two sets, for a total of 5 sets. Then I do reverse pec dec or bent over laterals. The reverse pec dec varies by machine(I work out at two different gyms)bent over laterals 20 or 25lbs 9-12reps for a total of 4sets.Then I will do behind the neck press on smith machine with low back bench or military press on the flat bench. On military I will do 50lbs. 11reps. For behind the neck press 115 for 10 reps total 3 sets. Then shrugs, but they are working fine. Then upright row with flat bar at 80lbs. for 3 sets 11reps. I also do a core exercise every day. I keep a journal and do my best to go up in reps or weight at lest every other work out.