A recent study by Brigham and Women's Hospital and the National Cancer Institute found a direct relationship between levels of physical activity and increased longevity, regardless of body weight. The results revealed that walking briskly for just 11 minutes per day was associated with a gain of 1.8 years of life expectancy, compared with doing no such activity. Walking briskly for 43 minutes a day was associated with a gain of 4.5 years Facts...