Make pacing your weapon.
Never Bonk Again turns physiology into real-time decisions on your bike computer.
Bonking isn’t sudden. The failure is sudden.
In hard races and long endurance events, athletes rarely fail because they “stopped trying.” They fail because physiological cost quietly rises until the body can no longer sustain output.
Traditional metrics and screens on bike computers are useful—but most are not designed for race decisions:
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Power and heart rate show effort, not proximity to collapse
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Metrics like TSS/IF/NP explain rides after the fact
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Environmental stress (heat, altitude) changes physiological cost dramatically
Never Bonk Again exists for the moments that matter: pacing, surges, climbs, and attacks—when the wrong decision can end your race.
Two real-time indices. One purpose: prevent performance collapse.
Never Bonk Again models three real physiological constraints and translates them into two clear indices you can act on instantly.
Aerobic Depletion Index
Represents the athlete’s endurance sustainability relative to FTP under ideal conditions.
It reflects the gradual loss of durable, steady-state capacity as effort, fatigue, and environment accumulate.
Influenced by:
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Power relative to FTP
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Rolling endurance load (recent 60 minutes)
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Total exertion time
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Cadence strain
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Temperature and altitude
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Recovery-related modifiers
Anaerobic Depletion Index
Represents the athlete’s ability to sustain repeated high-intensity efforts above aerobic limits.
It models two separate limiters and displays whichever is currently most restrictive:
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Lactate burden (accumulation + clearance)
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W′ balance relative to critical power (finite high-intensity capacity)
Practical meaning: how many “matches” you have left for surges, attacks, and long climbs.
This system is intentionally framed from an engineering perspective: taking well-accepted principles from endurance physiology and translating them into a real-time decision framework that works on portable devices with today’s sensors.
It is not designed as a lab experiment. It is designed as a practical tool for athletes—using:
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power-based modeling
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lactate dynamics
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critical power / W′ concepts
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decoupling as a marker of sustained overload
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environmental modifiers (heat + altitude)
Applied physiology, engineered for real riding
Built to win—not post-ride analysis.
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Pace smarter in long races: avoid slow collapse in the final hour
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Time attacks with confidence: know when you can surge safely
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Climb without blowing up: manage effort when cost rises unexpectedly
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Improve time-trial discipline: reduce early overreach, finish stronger
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Make strategy visible: detect when internal strain rises faster than output
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Turn physiology into decisions: your computer becomes a true race tool
Never Bonk Again doesn’t make you stronger. It helps you use your strength at the right time.
Setup in minutes
Install Never Bonk Again from the Garmin Connect IQ Store
Enter your athlete profile (FTP + optional HR metrics)
Go for a ride. Your fatigue indices update in real time
After your ride, personalized factors will be calculated and updated automatically.
Subscribe and un-lock all the features
