via Reel Rock on YouTube

This video will make some people sweat just from watching it. How Alex Honnold actually had the courage to make the video is a mystery.

In January, Honnold made history by becoming the first person to ever scale El Sendero Luminoso (Mexico) without the help of other climbers or safety equipment. That's right, one wrong move could have produced devastating results.

El Sendero Luminoso is rated at 5.12d on the Yosemite Decimal System, which means "the surface is as smooth as glass and vertical." The highest classification on record is 5.15c.

What an incredible feat.

[The North Face, h/t Devour]