If the idea of walking or running around in the cold sends you into a fit of shivers, fear not. Plenty of indoor exercises are available to you. Owoc says, "The best indoor/at-home exercise are 'multi-joint' exercises that can increase strength, balance, and coordination." For example, try squats with a bicep curl, lunges with a twist, push-ups, various planks, dips or even yoga.
Karen Owoc; Clinical Exercise Physiologist; San Francisco