This lack of activity has led to new health problems such as obesity and heart trouble. Exercise helps burn excess calories and prevents obesity. A person who keeps a normal weight is less likely to have a heart attack in later life. The heart of a person who is in good physical shape can do the same work with fewer heartbeats. Many people who exercise regularly will have values in the 60s.
Blood pressure tends to be lower in people who exercise.
Thus, the heart doesn't have to pump as hard. Lower blood pressure helps prevent heart attacks in later life. Exercise tends to build extra blood vessels in the heart. This lets more blood flow to the heart. These high blood fat levels can lead to early aging of blood vessels.