1 reason for warming up and cooling down is because if you don't warm up during your dancing session, you could easily pull a muscle or damage something in your body. It is the exact same for cooling...
Because otherwise you risk pulling a muscle, and probably it will save you from feeling all stiff and sore in the morning, hope this helps,Janet WalkerUniversity of Dance, London
clown fish cannot actively cool down their bodies, they are poikilotherms. their body temperature is dependent on the water temperature and therefore so is their metabolism