Bundle up for a winter jog or wear just enough to keep from shivering?
"You should dress as if it's 15 to 20 degrees warmer outside than the actual temperature. It will be chilly at first, but you'll warm up. If you're overdressed, you can overheat, leading to excessive sweating, which can cause leg cramps and put you at risk for hypothermia. For very cold days, I recommend pants or tights, a moisture-wicking top, a hat, and gloves. And a windbreaker is a must—it'll keep out the chill if the temperature drops."—Elizabeth G. Matzkin, MD, surgical director of the Women's Sports Medicine Program at Brigham and Women's Hospital
Next: Dr. Oz's 7 secrets to stay cold-free all winter