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shivering warms the body up.
because your body is warm so it heats it up
Stretching is warming up. Therefore, it is OK to stretch if the weather is hot and body is already warm.
your body sweats to cool down and shivvers to stay warm
There are changes brought up in animals and plants. It is due to evolution.
Throw yourself in a fire, it might get warm (Possibly).
because you are warm and kitty's like to be warm!!MEOW
Exothermic and endothermic both have to adapt to the climate changes. For example exothermic need to move in the sun or light source when they are cold and move to a cool place when they are hot. Endothermic have to let their body temperature warm up by being in the warmest place possible, when they are cold they instantly start trying to warm up automatically.
I will come and warm you up
Increase the body temperature.
the general purpose of a warm up is to let the body know what is coming make sure to stretch a lot and run easy on the warm ups. but it will prevent you from injuring yourself to so always warm up!!
drink hot tea