Name: Never Bonk Again – Adaptive W′ & Endurance Tracker
Rating: 4 (4 reviews)
Author: Domestique

Know when you're about to blow up—before it happens.

Never Bonk Again is a real-time race pacing tool that shows how close you are to your physiological limits, so you can make better decisions when it matters most.
No guesswork. No post-ride analysis. Just real-time clarity.

Learn what NeverBonkAgain does in this video: https://youtu.be/MVjY6wzma6o

During your ride, Never Bonk Again displays a simple, easy-to-read data field that turns your effort into actionable insight:

ENDURANCE INDEX (Below FTP)
Shows how much of your sustainable capacity you’ve used. Helps you avoid building fatigue that quietly ruins your finish.

SPRINT INDEX (Above FTP)
Tracks how much high-intensity effort you have left. Helps you decide when you can attack and when you need to hold back.

CRITERIUM MODE (Built for racing)
When enabled, Criterium Mode focuses entirely on your high-intensity capacity (W′ and lactate) and displays it as a large, easy-to-read bar across the entire field, along with your remaining matches.
Each match represents a short, maximal effort (approximately 10 seconds at about 2x your FTP).

This allows you to instantly see how many efforts you have left, even during sprints, attacks, and repeated surges, without distraction.

Ideal for criteriums, aggressive group rides, and races with constant accelerations.

WHAT DOES THIS MEAN IN A RACE:
Avoid blowing up late by managing fatigue before it becomes irreversible
Time your attacks with precision
Know exactly how many hard efforts you have left
Handle repeated surges without guessing
Make pacing decisions based on your body, not just power numbers

WHY IS THIS DIFFERENT
Most cycling metrics like average power, normalized power, intensity factor, and TSS summarize what you have already done. Never Bonk Again shows what that effort is doing to you in real time.

It models how fatigue actually builds during a race by combining muscular fatigue, lactate accumulation, W′ depletion, and environmental factors like temperature and altitude.

PERSONALIZED DATA ANALYSIS
Unlike standard metrics that use the same formulas for everyone, Never Bonk Again adapts to you.

The model learns from your performance and adjusts key factors over time, producing more realistic fatigue tracking, more accurate limits, and more useful race decisions.

FREE AND LICENSED VERSIONS

Free Version
Displays the Endurance Index, Sprint Index, and Matches Left using standard factors, providing immediate and useful race guidance.

Licensed Version
Adapts calculations to your individual physiology and records advanced data in Garmin Connect, helping you better understand and improve how your body responds to effort over time.

Get a license here: www.neverbonkagain.com

While “bonking” is often associated with glycogen depletion, riders experience performance collapse for many reasons. Never Bonk Again focuses on the muscular and biomechanical drivers of fatigue, helping you manage effort in real time so you don’t reach your limit.

If you race and want to push your limits without crossing the line and blowing up, give Never Bonk Again a try.

VERY IMPORTANT

This data field requires a Power Meter and Heart Rate Monitor. It will not work without these sensors.

Get the user manual here: https://www.neverbonkagain.com/_files/ugd/63af6e_1963b125a9d144a584a634178de49fdf.pdf

Very important: rider data matters

Never Bonk Again is science-driven. Accurate rider data is critical for reliable predictions.

This app requires:
FTP
Max Heart Rate
Resting Heart Rate
5-minute Max Power
2-minute Max Power

Why Critical Power (CP) is essential

For Never Bonk Again to be accurate, having a reliable Critical Power (CP) value is key.

CP defines the boundary between sustainable effort and intensity that rapidly drains you