This is the wierdest thing. When I first start out on a ride, I feel really out of breath. After about 10 minutes, my skin all over my body, even the top of my head, feels really tingly for about 10 seconds. Like the feeling I've heard people describe after lying in a tanning bed with that enhancer stuff on. It's very intense and I wonder for a second if I'm going to pass out, then bang it's gone and I feel better than when I started and my lung capacity seems to double! Very wierd. Been told I'm a 'good candidate' for asthma, so I'm wondering if anyone with 'official' asthma has done this?