calorific

Calorific is a good word for describing something that generates heat. A motorcycle race can be calorific in at least two ways: The engines get burning hot, and watching the race can make you burn with excitement.

In today's diet-obsessed world, you'd be forgiven for thinking that calorific means "filled with calories." In fact, when you do something calorific you don't load up on calories; you get rid of them. Say you drink a bottle of soda and then jump on the treadmill. All those calories you just poured down your throat? You're burning them up, turning them into heat. Running is a calorific activity. And a sweaty one.

Definitions of calorific
  1. adjective
    of or relating to calories in food
    synonyms: caloric
  2. adjective
    relatively high in calories
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    Antonyms:
    calorie-free, light, lite, low-cal
    having relatively few calories
    fat-free, fatless, nonfat
    without fat or fat solids
    show more antonyms...
  3. adjective
    heat-generating
    “the calorific properties of fuels”
    Synonyms:
    hot
    used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning
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