And then, the unthinkable occurred: he slipped and fell down.
An unseen trench caught onto one of McIntosh's skis and he lost it. McIntosh couldn't stop his downward motion.
He dangerously cartwheeled 1,600 feet down the side of mountain in under a minute.
"From there, my slough took over and their was no way to stop, I pulled my airbag to help prevent against any possible trauma injuries as I tumbled to the bottom," he said to Teton Gravity Research.
McIntosh finally stopped after falling down 1,600 feet. He panted heavily, looked up and said, "I'm okay."
Todd Jones of Teton Gravity Research, who produced the action, said on YouTube, "it was the most terrifying crash I've ever seen."
The entire fall was recorded on camera. Miraculously, McIntosh survived without any major injuries.
"He was able to walk away," Eric Henderson of Teton Gravity Research said to NBC News. "He's a big guy and he muscled his way."