I completed W4R2 last night. It was a good run even if the last part of it was uphill! I was wondering if anyone else had any back pain after running. I noticed it during W3 also but it seems to be getting worse (still mild pain but don’t want it to be exacerbated). It’s the middle part of back and it’s feels like muscular pain. Is it possibly my posture when running? Is it because I was quite out of breath during parts of the run? Any advice or stories of similar issues would be appreciated.