Coach Duncan Callahan brings over 20 years of ultrarunning and endurance coaching experience to the Boundless Coaching Team. With a background in cross country ski racing, Callahan began coaching at the junior level, soon after graduating from college in 2005. He has worked with ski racers competing at the Junior National and Junior World level, collegiate athletes competing at the World University Games, and masters athletes training hard to complete ski marathons across the world.

Coaching ultrarunning since 2009, Callahan has worked with hundreds of athletes who have successfully completed goal races from 50km up to to 250 miles. He has worked with numerous coaching groups over the years, and is bringing his 15 years of successful ultra coaching experience to Boundless Coaching.

Callahan’s personal ultra experience ranges back to 2006 and includes 50+ ultra finishes, 15+ 100 mile race finishes, and numerous wins at a variety of distances. Callahan boasts two victories at the Leadville 100 and considers the terrain of Leadville to be nearly sacred. It is with this personal passion, combined with strong coaching knowledge that Callahan comes to the Boundless Coaching Team to help others chase down their big goals.

Coaching Philosophy

Callahan aims to help athletes pursue their biggest goals with an eye toward longevity and a focus on overall physical and mental health. As such, Duncan believes training and racing should be a part of life and health as a whole, and not serve as a destructive or negative force.

Ultra History

• 50 - ultramarathon finishes
• 17 - 100 mile race finishes
• 9 - Leadville 100 finishes
• 2 - Leadville 100 victories
• 2 - Leadville Silver Rush 50 finishes
• 1 - Leadville Silver Rush 50 victory
• 1 - Ultra Trail Mount Fuji 100 finish
• 1 - Run Rabbit Run 100 finish
• 1 - Bighorn 100 finish