Throw yourself in a fire, it might get warm (Possibly).
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
because you are warm and kitty's like to be warm!!MEOW
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
Homeostasis
Warm-up or exercise
ivuerrgaris is awsome