New Delhi, Aug. 18 -- For decades, fitness culture has celebrated visible effort. Sweat, soreness, and relentless progression have stood in for health. That approach worked when bodies were younger, and recovery came easily. But as people move into their thirties, forties, and beyond, the limits of effort-driven training begin to show. Injuries linger, sleep fragments, motivation wavers, and performance plateaus despite increasing effort. A quieter shift is now underway in how we think about fitness, one that puts the nervous system at the heart of long-term physical capacity.

Aging is often framed in terms of muscles and hormones: strength declines, hormone levels shift, and joints stiffen. Less attention is paid to the nervous system, ...