Lumbago, sacroiliac joint dysfunction (SIJD), sciatica, arthritis, degenerative joint disease, muscle strain: there are many names for pain in the lower back. LumboTrain can help. People suffering in this way often find that a circular pressure massage (friction massage) in the lumbar region relieves the pain. This is exactly where the triangular visco-elastic friction pad is positioned in the LumboTrain: with every movement, its massage nodules help to reduce tension in the lumbar region and relieve pain. Size is determined in inches, by loosely measuring the circumference just below the waist.