I bumped into a wonderful video by Gil Hedley on fascia, where he explains and shows with a human cadaver how layers of connective tissue grow fibrils which movement disrupts. Lack of movement causes those fibrils to form a more solid network which inhibits movement.
In regards to yoga, one of the health benefits of the stretching is to disrupt these fibrils, and free up movement between layers of connective tissue, giving us more range of motion.
An amazing new study documented for the first time how meditation produced significant changes inside the brain’s gray matter, as shown by MRI scans in an 8-week Mindfulness-Based Stress Reduction (MBSR) Program at the University of Massachusetts Center for Mindfulness. “Although the practice of meditation is associated with a sense of peacefulness and physical relaxation, practitioners have long claimed that meditation also provides cognitive and psychological benefits that persist throughout the day,” says study senior author Sara Lazar, a Harvard Medical School instructor in psychology. “This study demonstrates that changes in brain structure may underlie some of these reported improvements and that people are not just feeling better because they are spending time relaxing.” The accompanying press release quotes Britta Hölzel, first author of the paper and a research fellow at MGH and Giessen University: “It is fascinating to see the brain’s plasticity and that, by practicing meditation, we can play an active role in changing the brain and can increase our well-being and quality of life”