India, Aug. 3 -- If you are squeezing in a short, brisk walk during your day, science just gave you a reason to keep it up. A massive new study tracking nearly 80,000 adults over two decades found that just 15 minutes of fast-paced walking a day is linked to a nearly 20% lower risk of death, reports Studyfinds.org.

The research, published in the American Journal of Preventive Medicine, stands out not just for its size but for who it studied. Most past studies focus on middle-class white Americans. This one? It zeroed in on low-income Black adults in the South-people often left out of health research despite facing higher rates of chronic disease and premature death.

Researchers at Vanderbilt University Medical Center wanted to see what ...