Approximately two months ago I started running consistently and aggravated an old high school back injury, which at the time was nothing major. Suddenly I began to experience muscle stimulation and pump more intensely on the right side than on the left. This happens during all training, lower body included.
I have symmetrical strength and size, but the stimulation/pump isn't. I have a close friend who is a successful Licensed Massage Therapist and we began to do some rehab, and he found some old scar tissue in my lower back just above L2/L3 as well as some newer scar tissue a bit higher on the right side.
This issue developed suddenly and it has not happened prior to a 6-8 weeks ago. I have taken the past 6 weeks off, hoping rest might help, but since resuming training this past week I am experiencing it again.
I was unfamiliar with the potential causes for something like this and wanted to see if someone else had experienced this and had success dealing with it.