Chilly weather forces the body to work harder to maintain its core temperature. This process, called thermogenesis, causes the metabolism to spike, ultimately helping us burn more calories compared to walking in warmer weather. A study published in the American Journal of Human Biology says, “those who trekked in temperatures between 15-23 degrees Fahrenheit burned about 30% more calories than those who exercised when the weather was a balmier 50 degrees.” If weight loss or maintaining a healthy weight is the main goal, a brisk winter walk might be just the thing you need!