Exercise strengthens your cardiovascular and respiratory systems
 
Regular exercise helps increase the "good" cholesterol and decrease the "bad" cholesterol in your blood. If you’re at risk of developing high blood pressure, exercise can help prevent it. If you already have high blood pressure, exercise can help lower it.

Exercise strengthens your heart and lungs. Your blood travels more efficiently, bringing much-needed oxygen from your lungs and nutrients to the rest of your body. This is one of the reasons why you generally feel refreshed and more energetic after exercise.