What is the purpose of placing a lumbar roll or rolled towel under the back?

Placing a lumbar roll or a rolled towel under the back primarily serves to support the lower spine. This technique helps maintain the natural curvature of the lumbar region, promoting proper alignment and reducing strain on the muscles and ligaments of the lower back. By supporting the lumbar spine, it assists in alleviating discomfort and preventing potential injuries, particularly during periods of prolonged sitting or while performing certain exercises. This support helps reinforce good posture and promotes spinal health, making it a crucial element for individuals focused on both rehabilitation and overall fitness.

The other options, while they may contribute to broader fitness goals, do not specifically capture the primary function of a lumbar roll. Enhancing flexibility and improving core strength are beneficial outcomes of various exercises and stretches, but they are not the direct purpose of using a lumbar roll. Similarly, increasing resistance during exercises pertains to strength training techniques and does not connect to the supportive role of a lumbar roll.