seeing that this is a shoulder injury im sure ill get some good feedback. basically my left shoulder is in a lot of discomfort. it happened about 1.5 weeks ago, i cant pin point any specific movement that did it, but it started hurting after i moved some cardio equipment into a trailer. what hurts is this? if i extend my left arm straight out in front of me like a front raise, there is discomfort like a (5/10) what really hurts is then moving that straight left arm across my chest in front of me that changes the pain to a (9/10) like putting on a seatbelt movement but keeping the arm up and across rather than across and down. im thinking a rotator issue??? suggestions on rehab things i can do to help it heal?