The phrase "shoulder muscles" refers to the group of muscles that are located around the shoulder joint. These muscles help us move our arms, lift heavy objects, and perform various activities that involve the upper body. Full definition
Although these will build shoulder muscles from all angles I will also list a few others exercises which will add variation to your workouts making them more fun.. (exercisegoals.com)
If you feel tension in your arm or back or waist there is something wrong in your position, fix your position until you feel tension only in shoulder muscles. (women-workout-routines.com)