Vigorous exercise like fast running might be harmful to your health over time, and light jogging is best for longevity, according researchers from the Copenhagen City Heart Study.

Researcher Peter Schnohr said, "It is important to emphasize that the pace of the slow joggers corresponds to vigorous exercise and strenuous jogging corresponds to very vigorous exercise. When performed for decades, this activity level could pose health risks, especially to the cardiovascular system. If your goal is to decrease risk of death and improve life expectancy, jogging a few times a week at a moderate pace is a good strategy. Anything more is not just unnecessary, it may be harmful."
The study is published in the Journal of the American College of Cardiology.
Source-Medindia