Excess belly fat seems to be particularly harmful, most likely because of its effects on inflammation and its association with elevated insulin levels, so if you tend to be more "apple shaped" and carry extra weight in your belly, it is especially important to lose weight, exercise regularly, and limit refined grains, sugar sweetened beverages, and added sugar in your diet.
Patients with a history of coronary artery disease should limit any cold weather exercise or activities, since there is an increased risk of heart attacks in the colder temperatures.