Our friend Sho used to ski a lot , so he was teaching Johnny how to ski . My poor baby , he fell a lot , but I think he also picked it up pretty quick . Fortunately I did n't forget too much so I could still keep up pretty well . But I was definitely out of shape .

Question: Why is the narrator struggling a bit ?
Answer: They lack cardio .None of the above choices .They used to ski a lot .They are just learning skiing .