When your basal metabolic rate increases and your little built-in heater grows, you may experience feeling warmer and even perspire more.
Try taking a cool shower or bath if you feel too warm and wear light, loose-fitting clothes. If it's hot or humid outside, don't exercise for long periods of time and stay out of the sun. Drink at least eight 8-ounce glasses of water daily and even more if you're sweating.