A response. Muscle motion used to produce heat rather than motion.
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For males, shivering fits are the direct result of actions taken by a woman wearing Enjoli perfume immediately after she brings home the bacon, fries it up in a pan, and then proceeds to never ever lets him forget he's a man..., 'cause she's a woman; Enjoli!
Not keeping warm in cold weather.Going from a warm temperature or spa to a cooler temperature or swimming pool.
Shaking chills may be caused from a fever. Also, extreme cold weather exposure can cause shaking chills for a person.
many thing
bad posture
excitment
music
GHOST
someone walked over your future grave
curse
weak abdominal muscels