I think it strengthens the shoulders as well but I am not sure how. For example, before weightlifting or barbell training, I was military pressing 145 at 180. After 6 months of weightlifting (power cleans, cleans etc...) my strict press has increased to 190 at 195lbs. I should note I haven't done any strict presses ( except for 2 sessions) and no push presses whatsoever. At this point I am curious about my potential. I added the military press into my program and am looking forward to pressing 225 soon. Unfortunately, it won't help my jerk but who cares.