Back in 2015 I broke my left arm at the elbow mountain biking. This meant I was in a sling for 6 weeks and unable to do any strenuous exercise for over 2 months in total. Even when I returned to exercise it wasn’t easy as my arm had severely restricted movement. I was unable to straighten the arm or fully flex.  As you can see from the below photos I lost a considerable amount of movement. I couldn't get my arm any straight or touch my shoulder as the pictures show. The big question i...