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New research suggests that weightlifting alone promotes healthy hearts. Harvard University researchers studied the role that different types of exercise play on heart disease risk. Among more than 44,000 men who participated in the Health Professionals Follow-Up Study, those who lifted weights for 30 minutes or more a week showed a risk reduction of 23 percent.

"People believe that weight training is beneficial for heart disease, but this is the first finding to support this belief," said lead author Dr. Mihaela Tanasescu.

Physical activity overall is important for reducing heart disease risk. In the study, aerobic exercises like running and rowing were shown to be beneficial for reducing risk. Based on the new data, however, physicians are considering a new role for weight training in their exercise recommendations.