...middle shoulder, front shoulder? I was longboarding and i developt a soreness that hurt when i moved my arm, not to bad pain, went inside 2 days laters went on a long fast ride with my friends, after a hour it hurt VERY bad, Bein me i kept goin for uhh 3 hours, today it was so bad i couldnt move without wantin to cry, cant lift my arm, even my uninjured right arm lifting makes my left hurt, if it is a pulled muscle how long till it heals? Thanks peace and blessings!