Do you enjoy a nice long soak in a hot tub full of water hot enough to blister your skin? Who doesn’t? How about spending time in a steamy sauna with sweat pouring off your body?
Maybe you like turning your thermostat down in the winter till it’s so cold you can see your breath in the house when you talk?
If these activities appeal to you then slap yourself on the back (yes that will burn calories too) because heating yourself up and chilling yourself down have been shown to boost your metabolism by about 20%.