I feel the topic discussed on Asthma was very superficial. The role of steroid preventers was not really emphasized enough. My personal experience as a long term asthmatic suggests that asthma sufferers who want to do better in their sports should see a respiratory physician and discuss their issues. Pre sports Ventolin is fine, but I think better overall control is superior.
I have wrote a bit on my struggles in this thread:
(Asthma and VO2 Max Sessions - #27 by gcarver)
Hope I have been helpful