There are two major muscles connecting these two poles ..shoulder to lower back ....are ...
Lattismus dorsi...
Trapezius ...
Plz cpntact a sport's physio to get it released ...
Next Steps
apart from these two ..you have minor muscle injury or strain in ..levator scapulae...q.lumbor.
and gluteus Maximus...
Health Tips
just follow the protocol decided by a physio ...and ..do icing fr 40 mnts at pain site ..