Exercise is an absolute must for good health, but overdoing exercise, especially for some members of the population, could cause an increase in the risk of cardiac disease.
According to researchers at the University of Illinois at Chicago, white men who over-exercise have a risk of heart disease that is almost twice as high as those who exercise in moderation. Researchers studied more than 3,000 participants over a five-year period, and found that white men who exercised for approximately 7 ½ hours per week were more likely to report symptoms of cardiac disease, including clogging of the arteries. White men were 86% more likely to suffer from symptoms of coronary artery calcification over time as compared to black males.
This should not, however, be taken to mean that you should stop exercising. Exercise in moderation is key to a healthy lifestyle.