Using your own body weight on the cylindrical foam roller enables one to perform self-massage, myofascial release, break up trigger points, and soothe tight fascia, and increase blood flow and circulation throughout the body.
Myofascial release is a method in which a masseuse or athlete uses gentle, sustained pressure on the soft tissues .This method leads to softening and lengthening of the fascia and breaks apart scar tissue or adhesions between bones, muscles, and the skin.
Foam rollers are an inexpensive yet highly effective piece of equipment that are easy to find in most sporting goods stores for less than twenty bucks. With some experimentation, you will be able to target just about any muscle group.
Take a look at the video attached which goes through some of the recommended areas to target.