According to good old Wikipedia:
Foam rolling is a self-myofascial release (SMR) technique that is used by athletes and physical therapists to inhibit overactive muscles. This form of stretching utilizes the concept of autogenic inhibition to improve soft tissue extensibility, thus relaxing the muscle and allowing the activation of the antagonist muscle.
This technique can be effective for many muscles, including: gastrocnemius, latissimus dorsi, piriformis, adductors, quadriceps, hamstrings, hip flexors, thoracic spine (trapezius and rhomboids), and TFL. It is accomplished by rolling the foam roller under each muscle group until a tender area is found, and maintaining pressure on the tender areas (known as trigger points) for 30 to 60 seconds.
The equipment that is used for foam rolling usually consists of a foam cylinder of various sizes; commonly 12 inches long, 6 inches in diameter. However, longer foam rolls up to 36 inches in length are produced for rolling over certain muscles in the back. A variety of foam roller densities exists, often denoted by the color of the roller. Those new to foam rolling, or those who have particularly tight muscles or severe trigger points, often start with a softer foam roll.
Got me kinda scratching my head at his actions lately. While quite far from being lazy (guy works long hours, not counting the 2-hour travel time to and from work), he’s not exactly the gym-rat type either. But then lately he’s into protein shakes and muscle milk and resistance training and now this. I’m thinking I gotta step up my fitness level too. Uhm. Pressured.