Mouse shoulder- repetitive strain in right arm. Any ideas to help?

[pharmachameleon]

This is for my DH and he's in real pain. He's an accountant and sits at his desk using his mouse and numbers of his keypad in work all day. His right arm has been sore for months and his physio has said that he has 'mouse shoulder'. The physio gave some exercises but he's still in loads of pain. Has anyone had this and can advise on tips to help? Thanks

A vertical mouse made a huge difference for me.

Thanks again everyone. With regards to what he does in the gym just now-he lifts super heavy weights and is really bulky on top. He doesn't work his legs out much. He has lifted weights since his teens and loves it but I think it might help if he tried to do some yoga/pilates etc. I don't see him doing this though-it would be so alien to him.