Pre Seed · Sports & Wellness · London, United Kingdom · Founded 2024 · 2–5 employees
Stamina is a personalized triathlon training app that generates adaptive, constraint-aware plans for athletes targeting Sprint through Ironman distances, launched publicly on the Apple App Store in November 2025. Founded in 2024 by former product managers and endurance athletes Willem Duyck and Shuowang He, the app targets time-pressed, digitally native athletes aged 20–40 who want structured coaching without the cost of a personal coach. The app integrates with Garmin and Strava and features a library of 600+ custom swim, bike, and run workouts designed in partnership with professional triathletes and coaches. Its training algorithm adapts dynamically to life events such as travel, missed sessions, and injury, making it a flexible alternative to static PDF plans. As a very early-stage startup incorporated in the UK, it appears to be bootstrapped or pre-seed, with no publicly announced funding rounds to date.
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