Getting into a groove on a good run of singletrack is one of mountain biking's classic highs. Rolling through a rock garden is one of mountain biking's trademark challenges. Doing both at speeds on the edge of human processing capacity is just sick.
Alejandro Paz has a series of these jawdropping runs on YouTube for you to use as stress tests for your inner ear. Seriously, put down your coffee. And maybe look for a helmet and pads. We don't know how he gets through some of this, but it is flat amazing.