Stress is considered a "good" stress when it

So-called "good stress," or what psychologists refer to as "eustress," is the type of stress we feel when we feel excited. Our pulse quickens, our hormones change, but there is no threat or fear. We feel this type of stress when we ride a roller coaster, gun for a promotion, or go on a first date. There are many triggers for this good stress, and it keeps us feeling alive and excited about life.

Animals will lose energy because it is converted to heat