A Pathway of Science
Forget the "I feel good today" mindset—that’s usually where method failures begin. To survive an Ironman 70.3 without triggering a total biological collapse, you have to manage your engine with surgical, data-driven precision. This page deconstructs the science of endurance by establishing definitive biological baselines, specifically a Functional Threshold Power (FTP) of 262W and a Threshold Heart Rate of 178 bpm, moving past guesswork to ensure absolute metabolic efficiency. Over a six-month training block, this disciplined approach proves the body physically remodelled itself, jumping from 270W to 292W at an identical heart rate to hold a faster pace for the same biological cost. By slashing erratic anaerobic "redlining" from 15 minutes to just 9 seconds and benchmarking performance against a global database of 40,000 athletes, we define the absolute limit of human endurance through an evidence-based framework.
Knowing Myself
The subjective feeling of "I feel good today" is a method of failure. Elite performance is defined through scientific data. To ensure the achievement of the 113km preparation, it is a must to verify power, load, and volume throughout training.
The Biology of Training
Endurance training is controlled through biological science, and build up to an elite sport level, athletes must push the body to its limits with triggering body system's total collapse. This must achieved through the balance of long-term cardiovascular gains and daily exhaustion.
The Cardiovascular Evolution
This telemetry tracks how your cardiovascular system adapts to sustained physical load. Over the six-month block, my mechanical output at a steady heart rate of 172 bpm jumped from 270W to 292W—a 22-watt gain. This proves that my threshold grew stronger, allowing the heart to pump more oxygenated blood per beat as training volume increased. Essentially, the body underwent physical remodelling, increasing mitochondrial density so I could hold a faster pace for the same biological cost. It’s about becoming more efficient so you can sustain higher power without collapse before the final run.
The Biological Baseline
To avoid biological collapse during a 113km race, moving past "feeling" and start managing training scientifically. This establishes your absolute benchmark: a Functional Threshold Power (FTP) of 262W and a Threshold Heart Rate of 178 bpm. By defining these zones, the training protocol teaches the body to stay efficient in Zone 2 (Aerobic) while building the strength to handle Zone 4 (SubThreshold) efforts without incinerating your glycogen stores. Essentially, as training volume increases, your threshold grows stronger, allowing the heart to pump more oxygenated blood per beat and letting you sustain higher power for the same biological cost.
Evolution of Running in Pacing
As my training progressed, the data shows a massive shift in how I managed high-intensity load, moving from unbalanced pacing to disciplined execution. In the early stages (Figure 1), I was spending over 15 minutes in Zone 6 (Anaerobic), which is a guaranteed way to trigger biological collapse and "bonk" during a 113km race. By applying systemic and scientific training, I successfully decreased Z6 time down to just 9 seconds in the later sessions (Figure 2). This shift proves that my pacing grew stronger and more precise, allowing me to stay in sustainable Threshold and VO2 Max zones to preserve critical glycogen stores for the final kilometres.
Figure 1
Figure 2
