What happens when your muscles quiver because its cold?

When your muscles quiver in response to cold, it's a physiological reaction known as shivering. This involuntary muscle contraction generates heat to help maintain your body temperature. Shivering is part of the body's thermoregulation process, as it increases metabolic activity to produce warmth in cold environments. Additionally, it can be a sign that your body is working to preserve its core temperature in response to the cold stress.