My muscles are just full of knots. There is no place you can touch on my body that doesn't elicit some sort of pain.
Stretching is a way of giving myself a massage, as I can't afford to have them done by professionals. It may hurt a little, but it relaxes my wound up muscles, and let's me have a moment of distraction from the nonstop pain.
I don't really have a system.
I have a very comfortable exercise mat, and will pop on an iPod or pull the mat in front of the television, simply letting my body do what it wants to do.