Breathlessness More Condition_symptoms What Apart From Weight, Can Cause Breathlessness?

What apart from weight, can cause breathlessness? - breathlessness more condition_symptoms

This theme is a little more weight and you go at least a couple of miles every day ..... but always out of breath. He is bent over to tie his shoelaces fear, because it is very short of breath. He also sweats excessively more than anyone I've ever seen.
But I live each day I see overweight people are the same breath, do not sweat and are very quiet. What can be with him?