A study published in the British Journal of Sports Medicine reveals that Americans over 40 can add up to 11 years to their lives by increasing physical activity. Those in the least active quartile could gain nearly 11 years of life by exercising like the most active 25%. The research utilized data from 36,000 Americans to analyze the effects of walking and other physical activities on life expectancy. The findings emphasize the importance of regular movement, suggesting daily activity can enhance life span and overall well-being.