Scientists have uncovered how exercise helps aging muscles regain their ability to repair themselves, shedding light on why physical activity remains one of the most effective ways to preserve strength and mobility later in life. The team found that exercise helps restore a critical balance in muscle cells that is disrupted with age. Strong, healthy muscles are essential for movement, metabolism, and overall vitality. From midlife onward, muscle function gradually declines. At the center of muscle health is a growth pathway known as mTORC1, which regulates protein production and muscle tissue maintenance. As muscles age, this pathway can become overactive,...