The only Triathlon app designed to live on your Apple Watch and Garmin.
Tired of messy PDFs and complicated spreadsheets? Theron builds you a pro-level training plan that automatically syncs to your watch. Whether it’s your first Sprint or your tenth Ironman, Theron adapts to your life, your sleep, and your recovery.
Designed specifically for Apple Watch and Apple Health users, Theron is the smartest way for beginner triathletes to reach their full potential without the risk of overtraining or injury.
The Power of Scientific, Adaptive Training
Theron’s proprietary algorithm doesn't just look at yesterday's ride—it analyzes the complete picture, including your health markers, sleep quality, training readiness, and long-term progress toward your race goal.
Intelligent Readiness: We use your Apple Health data (HRV, Sleep, Activity) to dynamically adjust today's intensity or duration. If you’re fatigued, Theron gives you an easier session.
Scientific Foundation: Training protocols are based on peer-reviewed sports science to ensure optimal periodization and peaking for your target race.
Dynamic Plan Adjustments: Missed a swim? Your plan immediately restructures the upcoming week to ensure you stay on track without double-counting or unnecessary stress.
Seamless Apple Integration
We make training on your Apple Watch effortless.
One-Tap Export: Export your entire workout (Swim, Bike, Run) directly to your Apple Watch or Garmin Device with a single tap.
Live Guided Workouts: Follow on-screen instructions and zones directly on your wrist, tracking all metrics via Apple Health or Garmin.
Perfect for Every Triathlete (Especially Beginners!)
Whether you're tackling your first Sprint or aiming for an Ironman, Theron provides the structure you need. Our intuitive interface and clear guidance make it the perfect solution for new triathletes looking to level up.
Theron supports all distances: Sprint, Olympic, Half-Marathon, Marathon, 70.3, and Full Ironman.
Start your journey with Theron and get your first 30 days of personalized, adaptive coaching absolutely free! Discover the smarter way to train using your Apple Watch or Garmin Device and Health data. No risk, just results.
Ratings & Reviews
4.0
out of 5
1 Ratings
• Theron's Take: daily AI coaching on your Today screen—a look back at recovery, guidance for today's session, and a heads-up on what's next.
• AI workout summary & score: after each workout, get an instant summary and score so you know exactly how it went.
• Redesigned training load view: see how your acute and chronic load build over time and what's driving today's status.
• Richer recovery data for a clearer picture of how ready you are to train.
• Weekly availability presets: save and reuse your training-time patterns.
• Password reset from the login screen.
• Faster launch, background syncing, and various bug fixes.
Version 1.0.25
The developer, Jele T Dekker, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Health & Fitness
Contact Info
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Theron Triathlon
Size
219.6 MB
Category
Health & Fitness
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
iPad Requires iPadOS 17.0 or later.
Mac Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
