Vigorous Exercise 3 Times Weekly Reduces Men's Heart Attack Risk By 22%

"Vigorous exercise" is known as training.

Training is the only way to improve fitness directly by physical activity.

Men who do vigorous exercise three times a week were found to have a significantly lower risk of having a heart attack, compared to those of the same age who did not, researchers from the Harvard School of Public Health wrote in the American College of Sports Medicine.

Train, don't exercise.