New Delhi, 21 Nov (ANI) : A new study had claimed that if you want to stay young, running might be the best way to do it. Running keeps one younger, at least in terms of energy efficiency. It is known for long that as people grow their maximum aerobic capacity, or 'horsepower,' declines which is also true for runners but according to the study old runners do maintain their fuel economy. Walking for exercise has many positive health effects, like fending off heart disease, diabetes, weight gain and depression