This is a message from mum:
You must with out fail or deviation do exactly as you are told. You will listen to your doc and physio therapists and will not think you know better and do more than you should. No stupid chair stunts. No stupid what can it hurt lapses in judgement. No stupid anything ... You can undo in a minute what you've spent months of recovery to achieve if you become impatient and do something foolish. Remember just because the pain has gone doesn't mean the shoulder is back to normal. It took 60+ years to get where you are in life now, be patient with the healing so that the next however many years can be enjoyed rather than ... damn, if only ...
Love you bro.