Brad Kearns visits with elite professional ultra-runner Zach Bitter. Besides being the national 100k champion and holder of many other titles and records, Zach is noted in the ultra community for his insightful blogging at zachbitter.com, and for his success at pushing the edges of human performance as a ketogenic endurance athlete.

As a participant in Dr. Jeff Volek's landmark FASTER study, Zach metabolized fat during exercise at nearly twice the previously believed absolute human maximum. Listen or watch on YouTube, as Zach discusses his revolutionary training methods, including how he uses ketogenic eating patterns to race more efficiently and recover faster. This dude is the real deal, and once ran 38 miles in 8.5 hours on no food!