I recently read an article in the New York Times that looked at the differences running and swimming had on the heart. Though the study was done on the athletes on one sigle occasion, the differences were measurable.
The Heart of a Swimmer vs. The Heart of a Runner [courtesy of The New York Times]
The article looked at higher level athletes and the study was specific to runners and swimmers, but it still was a reminder that exercise is good for your heart.
Fitness Is A Habit 