Foam roller ball; how to roll the glutes, hamstrings and active abdominal scars such as c sections and hernia scars. The new foam roller ball by Trigger Point Company is available through our offices is ideal for areas that a foam roller may not be able to adequately self treat. A roller ball is ideal for the gluteal region as well as the hamstrings. One thing the manufacturer may not have thought about is its ability to treat active abdominal scars. The most common active scars are c-section and hernia. For some people, these scars will become active meaning they affect the way people feel and function. The pain caused by an active scar can cause neck and back pain as well as sciatica. This video offers great advice on how to self treat these scars as well as the gluts or the hamstrings.