You should display better manners, especially with no practical experience in a subject. But, back to the question at hand, cardio and hills.
A Stair master and a hill are no more the same than hitting a bag and fighting a skilled opponent.
The handles on a stair master are different than the handles of a hill. (yes, that's meant as humorous sarcasm)
The stair master is a constant distance/angle of footstep distance and pace, a hill is not. Yes, you can adjust the pace of a stair master, but you can't on a hill. Your legs will do that for you. But only in one direction - slower.
Hills are just plain nasty, stair masters are, at the very least....cute?
Hills aren't smooth, some less smooth than others.
You can eat a sandwich while stepping on a stair master. When sprinting on a hill you tend to get mayonnaise on your mustache.
Real easy way to find out, though. Go find a hill.
As for gassing out during a fight, it can be frightening. Especially if/when your opponent realizes you're gassing. Getting hit while fighting sometimes interrupts your normal breathing cycle. There's an old saying in the fight game "Fatigue makes cowards of us all."
You can gas out even when you're in shape. Sometimes lack of sleep causes it, sometimes it's just a bad day. Sometimes it's stress.
A lot of times, a real lot - is your training camp leading up to the fight let you peak too early. You want to be nearing the top of the upswing towards your peak, not having already reached it.
I had a ski slope two miles from where I lived. Spring, summer and fall, I'd sprint up that hill. At the time I could fall asleep on a stair master, that's how boring those damn things are. Never fell asleep sprinting up that hill. Wanted to die a few times, but never fell asleep.
Now, go get that hill, bro!
