The shoulder joints are unstable and thus susceptible to injuries. My suggestion (though I'm not a medical professional) is to strengthen the rotator cuff (tendons) on a regular basis. The rotator cuff strengthening exercises like internal and external shoulder rotation do NOT use heavy weights, but just enough resistance (around 3 to 5 lbs) and plenty of reps to make your shoulder "tired" and NOT pumped.
By doing these, you'll likely prevent injuries when working out shoulders with heavy weight.
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