Our Story

BUILT BY
RUNNERS.

Capstone founder in the mountains
Where It Started

FROM MILITARY
SELECTION TO
TRAIL RACING.

Capstone was founded by Rob Sembiante, a former Navy Diver who discovered ultrarunning in 2019 as a way to keep chasing the kind of growth he found in military selection programs.

After leaving the service, Rob spent years living out of a van, traveling the country, running trails, and crewing some of the most grueling endurance efforts in the sport — including coast-to-coast FKT attempts across America.

Somewhere on those miles, it became clear: endurance doesn't just test you, it changes you. Rob wanted to build a platform that could deliver that experience to as many people as possible.

That platform is Capstone.

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Our Mission

ENDURANCE
CHANGES YOU.

We build events that demand everything — ultramarathons, military-style selection, and last person standing races designed not just to finish, but to forge something in the people who take them on.

Capstone exists to put you in situations that reveal who you are, and push you past what you thought you could do.

What We Stand For

THE CAPSTONE
STANDARD.

01
SUFFER HONESTLY

No gimmicks, no shortcuts. Our events are hard because hard things matter. We don't make it easy to finish — we make it worth finishing.

02
BUILD COMMUNITY

The people who toe the line at Capstone events become something. We build races that create lasting connections between people who've been through it together.

03
EARN IT

Every finish line at a Capstone event means something because you put in the work to get there. We don't hand out participation — we create genuine achievement.

04
SWEAT THE DETAILS

From course marking to aid station quality to race-day communication — the details are what separate a good race from one you remember for life.

05
STAY SCRAPPY

Capstone is a small operation built by people who actually do this sport. That means more care, more grit, and less corporate noise.

06
GIVE BACK

Free coaching, accessible entry points, and events built for real people — not just elites. We believe everyone deserves a shot at their limits.

4
Active Events
100+
Miles of Course
24
Hour Events
1
Driven by Passion
Rob Sembiante, Founder of Capstone Endurance
Former U.S. Navy Diver
Ultrarunner Since 2019
Coast-to-Coast FKT Crew
The Founder

ROB
SEMBIANTE

Founder & Race Director

Rob spent years in the Navy as a diver, where selection programs and high-stakes missions forged a deep belief that pressure — applied correctly — reveals and builds character.

After separating from the service, he traded his dive gear for trail shoes. What started as a way to stay sharp turned into a van-life chapter that took him across the country, running obscure trails, crewing FKT attempts, and immersing himself in endurance culture from the ground up.

He saw a gap: races that were hard enough to matter, run by people who actually gave a damn about the experience. So he built one. Then another.

Capstone is built around the same belief Rob carried out of the Navy — that putting yourself in difficult, uncertain situations, and choosing to keep moving, is one of the most transformative things a person can do.

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Ready?

FIND YOUR
RACE.

Bootleg Boogie, theSelection, Lake Trashmore Time Trial, Longhorn LPS — there's a Capstone event built for where you are and where you want to go.

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