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Everybody knows that exercise is essential to keep us [health / healthy] . It lowers the [risk / risky] of heart disease, and helps us to maintain a healthy weight. It also reduces stress and [makes / takes] us happier. Doctors say that exercising in cold weather is even better for [them / us] . Going for a jog or [even / ever] a swim when it's [chilly / chill] or freezing outside has extra benefits for our physical and mental health. The reason [from / for] this is that the cold gives our heart a more energetic workout. Dr Angela Pepdjonovic, from the Hospital for Special Surgery in New York, explained [what / why] . She said: "Your heart has to work a little bit harder [to / for] pump blood around your body…in the cold. This can help to [boast / boost] your endurance over time."

Dr Pepdjonovic said cold-weather workouts can help the body [burning / burn] calories at a faster rate. She said: "[Was / As] your body is required to work harder to maintain its [core / care] temperature, you actually increase your calorie burn by exercising [in / on] the cold." Physical activity in cold temperatures can boost [their / our] metabolism, which helps us lose weight. In the cold, our metabolism [shows / slows] down, so we can preserve fat and keep warm. Another [beneficial / benefit] is that being in natural light helps to reduce our stress. This is especially [so / that] for people who suffer from Seasonal Affective Disorder (S.A.D.). This is a type of [depress / depression] caused by the shorter, darker days of winter. It is more common [on / in] people who live far from the equator.