The surface of the GoFit Extreme Bar has molded firm bumps with an egg crate design which work like the fingers of a massage therapist. The bumps continuously knead the contours of your body, gently stretching soft tissue (muscle and fascia) in multiple directions. This action helps relieve trigger points, helps restore flexibility, and brings quick relief to common types of muscular pain. By design, the bumps are firmer than muscle tissue, but much softer than bone, so they deflect out of the way if they contact your spine or other bony protrusions. The Bar’s ball-bearing, “roller-pin” action helps you roll out soreness with ease.