The article “The Harmful Effects of Excessive Exercise” written by Susan Dawson-Cook best supports this fact. Ms. Cook states that “long-term excessive endurance exercise induces pathologic and potentially fatal structural remodeling of the heart and large arteries in some individuals.” This can be found to affect many marathon runners. Some studies show that “12% of apparently healthy marathon runners had evidence of patchy myocardial scarring” (Susan Dawson-Cook). She also states that this type of damage is found in “individuals over 40.” The Center for Disease Control and Prevention refutes her point by stating that the “health benefits of physical activity far outweigh the risks of getting hurt.” An hour a day of exercise is all a person needs to stay healthy and not drastically hurt