What are some good chest opening exercises performed on the Reformer?
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This is the first one that comes to mind. As others have said, ensure clearance from doctor / PT to see what types of movements have already been prescribed and contraindicated.
https://www.youtube.com/watch?v=Oy-WH08VKXc
The exercise linked can be done with several hand positions as well as variations of arm height when pulling back.