For warm-up, I do 2-3 minutes on the C2 rower and then:
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25 arm circles in each direction (swing arms around at extension)
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15 scap wall slides (https://www.youtube.com/watch?v=w3ZkueaK5Gc)
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15 shoulder dislocates with dowel (https://www.youtube.com/watch?v=02HdChcpyBs)
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push-ups
The only shoulder exercises I do are barbell standing shoulder press, barbell bench press and pull-ups/weighted pull-ups.