have you heard of this pec /chest stretch before?
it is really a good and easy gentle stretch-
if you can't do the roll because of discomfort - just lay out flat and place the arms out in a comfortable but slight stretch position and see if you can advance up to a rolled towel or pillow later.

it's post # 4 but the whole thread has some good info-
http://neurotalk.psychcentral.com/sh...ad.php?p=30184