I did my first Olympic last weekend and about 5 miles into the run, my shoulder felt like it was going to fall out of joint. It was bad enough that I had to slow down to let my arm kind of flop, as holding it for normal running form was excruciating. My position on the bike has my body mass directly over the arm pads, so no excessive extension. I noticed it on a 10 mile run I did a few weeks ago as well.

I separated my clavicle when I was 18 and it was never reattached, but it never caused a problem before during my 5 years of racing downhill mtb or then god only how many road miles I have put in over the last 15 years.

It has not bothered me while swimming, even on days I am doing 3000+ yard days

Has anyone else had shoulder issues while running? Or anyone who has historical shoulder issues experienced this kind of issue? If so, what have you done to correct it?

Thanks.