I think one thing you could do in order to measure your cardiovascular strength you can do a full sprint run. In order to help improve your fitness levels you can swim, jog/run, body weight exercises, and a balanced diet.
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Answer:
it's so nostalgic
(I need 20 characters ignore this part lol)
This is because you have had it before therefore your body knows how to get rid of it,you have also become more amuned to it.
we are able to get rid of a certain illness sickness or even pathogen faster the second time you get it due to the fact our bodies have had it before which mean they have experienced how to get rid of it
Jaun more than likely has asthma.Asthma is a condition that makes your airways narrow and swell produce too much mucus making your lungs very sensitive and can make it very hard to breathe in certain conditions
As we can see we already have the Symptoms,and,triggers that Juan suffers from.
hope this helps :D