Fueling for trail and ultra is a personal choice and there are many options. We share our experience transitioning to a high-fat, low-carb diet otherwise known as keto-friendly (but not strict keto). Elite ultra runners like Jeff Browning and Zach Bitter fuel with a high-fat, low-carb diet, and we share their hack to supercharge races and hard workouts. We reviewed much scientific research to answer questions like “can we run both far and fast” on a high-fat, low-carb diet. Thanks for watching!