Why am i so exhausted and out of breath after moving around a bit?

I don't' know your medical history but I can say that most people exhibiting those signs have some form of cardio or respiratory deficiency.... usually due to being overweight or under active. Also, those signs are sometimes from lack of nutrition... If that's the case, and you are normally active, you should focuson your diet. Perhaps you could drink more water. Lack of sleep or drug use can have that effect also. So can an infection or pregnancy......... there's too many factors without knowing more specifics.