NEW YORK (CNN) – “It’s the one thing, the magic bullet that everyone can do to reduce their risk of heart disease,” said Dr. Aaron Baggish. He is the Director of the Cardiovascular Performance Program at Boston’s Massachusetts General Hospital.

Dr. Baggish said exercise truly is medicine. He said, “Fewer medications, fewer depression, better sleep habits, better diet…these are all coupled with being active and exercising.”

And by extension, exercise can do something else, prolong life. In fact, Canadian researchers recently found that young adults engaging in 150 minutes of moderate exercise a week added up to five years to their lives.

“Really, no matter what decade in life you start exercising, you’re better off than were you to maintain a sedentary lifestyle. It applies whether you’re in the 3rd, 4th, 5th, 6th, 7th decade of life,” said Dr. Baggish.

Some older men may be concerned that starting an exercise program could lead to an increased risk of having a heart attack. And it turns out they’re right. But it also turns out that the benefits of regular exercise far outweigh that risk.