Its been 12 weeks since I broke my collar bone (broke in 4 places) I've done a few uplifts and done some XC since. Altho It feels pretty awesome when riding its clear I've lost loads of strength in my shoulders and arms I can't rag the bike around nearly as much as I could and also my jumping has really suffered! Also I'm kinda struggling with work (I'm a mechanic) my shoulder gets tired really fast. So what exercise would people recommend to help me get my strength back?

Cheers for all the advice.

I lost loads of strength after i was out for 4 months with myn.
You could see my left neck muscles was about 1/2 the size of my right!
I just found that it gained strength through riding but as it got stronger i moved onto light weights and exercises and now it is fine. Use to get pain early on but nothing really now apart from occasional clicking.