For the full article by Dr. Mercola on the video please click on the link here.
Summary of the article:
Extreme endurance cardio, such as marathon running, actually damages your heart, and can negate the health benefits you’d otherwise reap from a regular fitness program. Research has shown that once you reach 40-50 minutes of vigorous exercise per day, the benefits from your efforts plateau, and further efforts do not convey further improvements in life expectancy.






