A 2014 study found the cold not only makes brown fat more active, it also could cause you to increase your brown-fat cells.
"Browning fat tissue would be an excellent defense against obesity. It would result in the body burning extra calories rather than converting them into additional fat tissue," Philip A. Kern, who authored the study, said in a release.
"Similarly to exercise training, we advocate temperature training," the researchers said. "More-frequent cold exposure alone will not save the world, but is a serious factor to consider in creating a sustainable environment together with a healthy lifestyle."
Boost vitamin D and combat SAD
The shorter days of winter and lower temperatures can contribute not only to vitamin D deficiencies, but also to developing seasonal affective disorder.
One recommendation to treat SAD is a light therapy box, which mimics sunlight. But light boxes can’t boost your vitamin D intake. Exercising outdoors, even if it’s just going for a walk, can serve both the vitamin and fitness boost.
Strengthen your cardiovascular system
According to a study by the National Health and Nutrition Examination Survey, outdoor exercise could decrease your risk of dying from cardiovascular disease by up to 27 percent, CNN reported.
Exercising in cold weather challenges your body further and can help strengthen a healthy heart. The opposite holds true for individuals with heart problems, however.
Because the cold forces your heart to work harder, an unhealthy heart might struggle to pump blood through your body. A 2018 study published in the journal JAMA Cardiology found a higher incidence of heart attacks on days with lower temperatures and higher winds.
Any exercise is better than none at all, but being outdoors when there is a chill in the air can boost the benefits of your workout.