I’m almost postive somebody has already thought of this but I must share something I just recently started doing.
I have no idea what to call it. It’s rowing but not like what we are all accustomed to. lol
Take a fixed barbell. Maybe 30 40 pounds and standing row like your in a kayak.
It really works the shoulder traps and forearms very well and a light weight will set you on fire.
Try it guys