(HealthDay News) -- Winter can be hard for those watching their weight, the U.S. National Institutes of Health says. But you don't have to wait until it warms up to burn those calories.

Losing winter weight can start with equipment-free, in-home exercises:

• Squats.
• Push-ups.
• Planks.
• Wall sits.
• Lunges.
• Jumping jacks.
• Mountain climbers.

Working out for 30 minutes each day can burn hundreds of cold-weather calories.