BYU·Apple Watch + iPhone·Coming Soon·$7.99

Backyard Ultra

One more loop.

Back Yard Ultra is the most brutal race format in endurance sports. No set distance. No finish line. Every hour, you run 4.167 miles. Last runner standing wins.

The existing apps weren't built for it. Countdown timers that reset wrong. GPS watches that can't handle lap-based last-man-standing logic. A community that's been making do with workarounds.

BYU is the dedicated race-day companion — built specifically for this format, from start to finish to the moment after.

The Format

4.167 miles per loop · 1 hour per loop · last runner standing wins · no predetermined finish line · Lazarus Lake's original format

Apple Watch Timer
Sub-second countdown built specifically for the BYU format. Haptic alerts at 15, 5, 2, and 0 minutes — so you know without looking.
Color-coded Urgency
The watch face shifts as time runs down. You always know where you stand in the loop, even mid-stride.
Pace Decay Chart
Track how your pace changes across loops in real time. See the trend before your body tells you.
iPhone Race Hub
Set your start time, manage loops, and review your full race from your phone. Everything syncs automatically.
Race History
Every loop, every lap, every finish — stored locally on device. Review past races and track progress over time.
Built for the Format
Not a general-purpose timer with BYU settings bolted on. Designed from the ground up for last-runner-standing.

App Screenshots

Race HomeRace Home
Active RaceActive Race
Upcoming RacesUpcoming Races
Race HistoryRace History

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