I've been running week 8 outside (parks and pavement) having completed the first 7 weeks on a treadmill at the gym. After w8r2 I started to get a sore shoulder with pain starting in the lower right neck, passing down into the right shoulder blade with some numbness in my right arm. The pain has lasted well over 24 hours since the run.
I'm assuming that my shoulders aren't relaxed enough when running and was wondering if anyone else has had the same experience or any tips for getting and keeping the shoulders relaxed. I can't imagine that my running style differs vastly as to whether I'm indoors or out. I'm wondering if it is because I would usually do 10 minutes on a cross-trainer at the gym before hitting the treadmill so my arms/shoulders could be considered warmed up I suppose. The only other difference is I wear a bottle belt to run outside whereas I was running 'free' at the gym.
All thoughts very welcome