Ultrarunning isn’t just a test of physical endurance it’s a crucible for emotional resilience. Whether you’re grinding up Hope Pass at Leadville, managing stomach issues at Foresthill at Western States, or riding the mental rollercoaster of the Moab 240, your ability to regulate emotions becomes as important as your training plan.  Research increasingly shows that how ultra runners manage their feelings mid-race can influence performance, recovery, and mental health. Here’s a look at the science and why an Acceptance and Commitment Therapy (ACT)-based mindset can help.