Physical therapists, trainers, and athletes use foam rollers to relieve muscular pain and tightness (often called “”adhesions”", “”knots”", or “”trigger points”"). But conventional foam rollers have smooth, hard surfaces that further compress soft tissue. Rolling on top of them improves blood flow and tissue flexibility, but the effect is limited and relatively superficial, unless you spend a lot of time rolling. The Rumble Roller was created to perform this therapy more effectively. The surface of the RumbleRoller contains specially designed bumps that are firm, but flexible, much like the thumbs of a massage therapist.
As you roll over the top of the Rumble Roller, the bumps continuously knead the contours of your body, gently stretching soft tissue (muscle and fascia) in multiple directions. This action erodes trigger points, helps restore flexibility, and brings quick relief to common types of muscular pain.
They are available in 2 sizes with 2 firmness levels. The original density (blue) works well for most people. The extra firm version (black) is designed for people who have especially dense muscles that do not respond to normal massage pressure.