Early in my introduction to strength training it was impressed upon me to perform some common rehab exercises to fortify common areas of weakness and instability. For pulling and pushing variations on external rotation have been indispensable.
Below you will find a few variations of my preferred exercises.
Unless you are actually rehabbing an injury (in which case, I recommend working with a physical therapist) it may be advantageous to pick one of these exercises per 6-week training cycle and conclude your practice here.
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Blog Photo: Joe Longo