Extreme runner Karl Meltzer, a.k.a. Red Bull’s “Human Express,” worked his way into Wyoming over the weekend, crossing over the Continental Divide, and will close in on the 1,000-mile mark of his trip on Wednesday.

“Running yesterday out of Cottonwood [Utah],” he updated his fans on his Twitter account over the weekend. “Dare I say I FELT AMAZING. Cannot believe it, I am on week 3”

The 42-year-old athlete is slated to run 2,300 miles of largely unpaved trail along the old Pony Express route from Sacramento, CA to Kansas City, MO.

According to Red Bull, Meltzer burns only about 2,800 calories per 50-mile day. His average heart rate is pegged at about 100 beats per minute.

Global Rescue is providing medical evacuation coverage for Meltzer, with aircraft and ground transport on standby throughout the route in the event of a medical emergency.