Here's a few more exercises that you can add to your warm-up, after training or even load them up and use them in your workout. They all have in common the aim of developing your ability to control the movement of the scapulae in isolation, in the process strengthening the muscles responsible and hopefully as a by-product preventing shoulder pain and injury. As with the other exercises I described in the last post, it helps to try and 'feel' these as much as possible. What I mean by this is concentrating on which muscles are working, how your scapulae move and how you can alter the movement by moving the scapulae into different places.
See how with each of these exercises, scapula movement occurs with minimal movement at other joints. The exception is the band protraction. I included this one because it combines protraction of the scapulae, strengthening serratus anterior, with a nice stretch of pectoralis major and other humeral flexors when the arms are behind the body. Efforts should to emphasise scapular protraction over humeral transverse flexion in this exercise to minimise the contribution of pec major; the stretch should assist this.