If you do not feel like stepping outside to exercise then opt for an online workout program. Look at workout videos, join a zoom dance or yoga class or use fitness apps
One of the easiest ways to stay active in bad winter weather is to engage yourself in household chores like sweeping, cleaning, gardening, walking up and down stairs, etc
While some people work out in the evening after office, it can be helpful to exercise during the day in winter when the temperature is warmer
Wear several layers of clothing to keep your body insulated when stepping out to exercise. It will keep you comfortable and give your body time to adjust to changing temperature
Create a home gym with some basic workout equipment like a stability ball, resistant bands, yoga matts, etc for the days you feel lazy to step out