Discuss the relationship between exercise and heart disease?

Every day, your own heart beats 100,000 times and pumps the equivalent of 2,000 gallons [7,600 L.] of blood through your body’s 60,000-mile [100,000 km] cardiovascular system. No other muscle works harder than this masterpiece of divine engineering. In adults, cardiac output varies from 5 liters [10 pints] a minute—5 liters being the approximate amount of blood in the body—to as much as 20 liters a minute during exercise.
Previously it was thought that only vigorous aerobic exercise brought health benefits. But strenuous workouts are not necessary to improve fitness. In fact, “burning as few as 150 calories a day [by mild exercise] can reduce the risk of heart disease, high blood pressure, cancer and diabetes,” according to the surgeon general’s report
Sedentary people have a higher risk of heart attack. They spend most of the day physically inactive and do not exercise regularly. Heart attacks often occur in these people after strenuous activities, such as heavy gardening, jogging, picking up heavy weights, or shoveling snow. But the risk decreases among those who exercise regularly. The bible tells us " Above all the things that you guard, safeguard your heart, for out of it are the sources of life." Proverb 4:23
For more information on this subject and others, please go to www.jw.org "Online Library." Also for free downloads, publications or read online.
.