Green Zones26.7, the Sun & Your Lumbar Muscles Posted on October 20, 2026 by Physiofit 26.7, the Sun & Your Lumbar Muscles The Sun has a magnitude of -26.7 as seen from your beach chair. A magnitude with lower numbers means brighter objects. The sun is the brightest object in our sky, hence the large negative number. In a 2022 research study examining a connection of low back pain, specific low back muscles and spinal degeneration; the number 26.7 also appears. 26.7% was recorded as the pure muscle cross-sectional area proportion (%MCSA) for the lumbar multifidus L4-5. This number represents the remaining lean muscle mass percentage at the L4-L5 level for patients who presented with two or more levels of severe spinal degeneration. If you have a % MCSA of 26.7%, it means that out of the entire multifidus muscle boundary, only 26.7% is viable, contracting muscle tissue. The remaining 73.3% has been replaced by fat and non-functional tissue. In other words, only ¼ of the muscle is naturally working. This is not cool for your low back’s primary dynamic stabilizer. The threshold of 26% to 28% MCSA marks severe structural failure within the lumbar spine. This is directly correlated with chronic back pain, leg pain and disability. You don’t want to enter this zone. Or enter the surgeon’s fusion recommendation. That is why the lumbar multifidus muscle is 1 of our 6 Green Zones. Longevity. Healthspan. Prevention. If this is something that can make your life better, feel free to contact us at 919-728-0335 or schedule online to get you back on track! Physiofit 37.9, phone grayscale & rotator cuff