Nice Tricepts.  That is important for shoulder strenght, flexibility.  A buddy's wife was a nurse, and she injured her shoulder on the job, and has been out of work for a while.  I have seen guys do shoulder shrugs, with heavier weights.  Not lifting with their arms, just raising and rotating their shoulders.

I have pulled my tricepts a few times, lifting things to the side.  I try to do the Airplane exercise, with my arms extended to my sides, and turning my arms in 1 foot circle, nealry horizontal.  Sometimes I use light weights, and arm raising motions, with my palms downward, to strenthen, and make my tricepts more flexible.