My shoulders have always disliked isolations. They took quite a beating in my teens from pitching about a thousand innings a year...we had a playground across from my house. Whenever I do too maybe laterals or flyes, I start to feel a bit rough.
And I'm not sure what my issue is with curls, but too many sets and my tendinitis flares up quickly.
I am mentally like Mulder...I want to believe
in isolations...but physically I am Scully...I've never really used them, and have a hard time seeing the value.
I hope no one reading this equates my sentiments as meaning "they have no value". I just - personally - see no value in them.
But if they helped my joints, I'm sure I would use them for pre-hab.