it effectively turned sedentary 55-year-olds into 30-year-olds when viewed through heart activity monitoring equipment.
Being that heart disease is the leading cause of death for most people in the United States, and cardiac strength is inversely correlated with heart disease, it’s probably one of the most significant studies on exercise ever carried out.
It was basically 1.5-2hrs at the gym twice a week, plus 1.5-2hrs doing some physical activity (hiking or the like) once a week for the first year, then what was probably light cardio a few times a week the next year for the benefits. Not too much effort for feeling the benefits of improved heart benefits, as well as probably lowered risk of heart attack.