I enjoy bike riding also, though I haven't been out as much as I used to be. I always had such trouble riding up hills...having asthma just makes things more complicated.

However, I very much enjoy going down the hills. The faster the better. I've considered the fact that I might be a bit of an adrenaline junkie, but I haven't been doing much of that lately...my brakes keep seizing up which is probably a very bad, dangerous thing!