[starry12345]

So, to simply "raise temperature"?
Strenuous exercise. Specifically, weight training. Strength or Powerlifting.
Exercises are Olympic lifts, especially squats and cleans.

Hot tubs, too, and saunas, and hot showers. (also increases insulin sensitivity.)

Then, there are internal means, too.
Ginger, Capsicum (from hot peppers), and of course, Iodine.

Then, diet, in general: Make sure you're eating properly WRT macronutrients. Good fats, enough protein, minimize carbs. And when you re-feed on carbs, you'll feel a "rush", and metabolism will spike briefly (and then crash, so plan it and be careful.)
Protein has the best thermic effect of food types, meaning, you'll use the most energy to burn it. But the body knows how to turn protein into glycogen, as noted elsewhere on this board (Gluconeogenesis).

Question you're probably asking, why not list cardio?
Cardio eats muscle. That means lower basal metabolic rate. That means colder body. :-)
Compromise by replacing steady-state aerobics with intervals, or swimming. :-)

-Dianna

thank you! so i need to have more muscle