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Exercise is 
 for our health. It lowers the 
 of heart disease, helps us to maintain a healthy weight, and reduces 
. Doctors say that exercising in cold weather is good for 
. Going for a jog or a swim when it's chilly outside has extra 
 for our physical and 
 health. This is because the cold gives our heart a more energetic 
. A doctor from the Hospital for Special Surgery in New York explained why. She said: "Your 
 has to work a little bit harder to pump 
 around your body…in the cold. This can help to boost your 
 over time."