Skiing The United States' Steepest In-Bounds Trail

Petersen, besides being a high-octane skier, is also an ultramarathon runner and a ski writer, using his wide reach in the outdoor world to advocate for mental health and "being a good ambassador of the sport." 

Petersen's film Ups + Downs was extremely well-received by audiences everywhere, and Petersen wrote that "the number of people that have reached out to me and opened up with their own stories continues to amaze me. All of these struggles—all the way to my struggles with suicidal episodes—are truly normal. I didn’t fully believe that until now, but if I could have known that when I was at my worst, I would have felt much less alone."

Petersen's written work has appeared in Outside, SKI Magazine, POWDER Magazine, The Ski Journal, Freeskier Magazine, and Backcountry Magazine, among others. 

But, going back to his skiing (after all, POWDER is The Skier's Magazine), Petersen treats terrain the same way he treats his advocacy: by attacking it with creativity and repetition. 

Rambo is, as Peterson mentioned, the steepest tree-cut inbounds run in North America, specifically located in Crested Butte. From the top, you can see the bottom beneath the trail before you can see the trail in its entirety (in other words, it's steep). 55-degrees steep. 

To make matters worse, the pitch does not subside as you move forward (down the mountain) and there are shrubs all the way down. 

It may not be a true no-fall-zone, but it is an unadvised-to-fall-zone. 

The run lasts 900 feet, and Petersen rips the whole thing up, turning to avoid the trees but keeping an impressive speed and flow til he reaches the stoked skiers at the bottom.