Benefits of being active:

Increase your energy level by delivering more oxygen to your body. Exercise helps boost circulation and endurance.
Weight management. Exercising daily will help control weight gain or help maintain weight loss. The more intense the exercise the more calories are burned.
Fighting adverse health conditions and diseases while improving your chances of living longer.
Exercise keeps your blood flowing which decreases risks of cardiovascular diseases.
Helps prevent heart disease and stroke.
Lowers your risk for certain types of cancer as well as developing type 2 diabetes.
Increases flexibility and mobility and is shown to improve arthritis symptoms.
Relieves symptoms of depression and anxiety.
Exercise is a stress reducer. It also releases endorphins in your brain to keep you happier and more relaxed. As well as promotes a better night's sleep.

The cost of being inactive:

Increases the chances of becoming overweight or putting on unwanted extra weight.
An increase of anxiety or depression due to increased weight and declining body appearance.
Higher chance of cardiovascular disease, type 2 diabetes, stroke, and cancer.
Lower life expectancy than those who exercise regularly and live a healthier lifestyle.
Higher medical bills and health insurance costs.
A very decrease quality of life for senior citizens who do not exercise and who have never exercised.
Less flexibility and mobility and worst pain and aces from arthritis which has a better chance to develop in individuals who do not exercise.