I'm sure it must be good for it in the same way cycling is good for knee injury's.
I did some shoulder damage painting the ceiling at home and it was pretty painful and told I'd probably need surgery.
With all the paddling I've done it's come good.
I did get a little bit of aches and pains of a different kind from using a home made alloy shaft paddle but since I got my light weight Kialoa paddle it's all good now..

DJ