[quote="Mary"][quote="GenTDuke"]You should find out your lung capacity, 3 to 4 litres is normal 5 is great and six is elite.
Oh, wow! You are kidding, right? My doctor tested my lung capacity when I was asthmatic (I'm not any more) and between attacks my lung capacity was 5.6. How the hell did that happen? (My asthma disappeared over night when I went vegan. Now, I wonder why that was?)
I think lung cpacity is mostly genetic, but I am not sure, if you had severe asthma like an attack everyday that would be the eqiverlent of using these trainers, using it reminds me of my asthma I used to suffer from back in the day.