The subscapularis is a muscle that I'm starting to work on with myofascial release. It's a little bit tricky to get at because it's underneath the scapula but I can tell it's a very tight. Until recently, it's a muscle I wasn't aware of.
http://www.google.com/imgres?imgurl=...ed=0CEYQrQMwDQ
http://www.functionalpatterns.com/ro...t-here-you-go/