Easy mileage, threshold, HM-specific work, long runs and tapering serve different purposes. PACE organizes them so the week is not just full, but directed.
A good workout is not only “done”. Pace, heart rate, RPE, structure and progression can show whether your performance level has changed.
As race day approaches, specificity, durability, pacing and freshness matter more. Training changes with timing.
The scientific principles behind PACE
PACE does not turn one paper into a training plan. The engine combines several established principles and translates them into concrete decisions for your week.
Lots of controllable work. A few targeted hard stimuli.
Systematic reviews in distance runners support models with a high proportion of low-intensity work plus deliberately dosed threshold and higher-intensity training rather than making most runs threshold-heavy.
Understand workout types →The stimulus changes toward race day.
Foundation, specific training and tapering solve different problems. PACE combines that time structure with your real training state rather than simply advancing calendar weeks.
Understand periodization →What matters is not only how good you are when fresh.
Performance characteristics can deteriorate under prolonged load. Long runs and Race Intelligence therefore also look at what is still available late in a session or race.
Understand durability →Recovery is what makes quality possible again.
Subjective feedback, sleep, HRV, resting heart rate and recent training load create context together. The objective is not maximum caution — it is the next high-quality decision.
Understand recovery →Running economy can improve outside running, too.
Meta-analyses indicate that well-integrated strength and plyometric training can improve running economy and performance-related factors in distance runners.
Strength for runners →Bring fitness to the start line.
Before a race, training volume drops while relevant intensity can remain. The taper should uncover existing fitness, not try to create fitness at the last minute.
Understand tapering →How that becomes a PACE decision
How PACE tests its own logic
Alongside external literature, PACE tests training logic in reproducible simulations and replays. Scenarios include progression, different recovery states, missed and extra runs, taper, race week, post-race recovery and the response to weather and route context.
Selected scientific sources
- Casado et al. 2022. Training Periodization, Methods, Intensity Distribution, and Volume in Highly Trained and Elite Distance Runners.
- Campos et al. 2022. Training-intensity Distribution on Middle- and Long-distance Runners.
- Saw, Main & Gastin. 2016. Monitoring the athlete training response.
- Düking et al. 2021. HRV-guided endurance training with wearable technologies.
- Llanos-Lagos et al. 2024. Strength training and running economy.
- Maunder et al. 2021. The Importance of Durability in the Physiological Profiling of Endurance Athletes.
- Wang et al. 2023. Effects of tapering on performance in endurance athletes.
PACE is evidence-informed and its software logic is systematically tested. The cited studies support training principles and individual product decisions; they are not a controlled effectiveness study of the complete PACE product. External validation of forecasting and readiness on real athlete data remains a separate ongoing step.
Science is not the endpoint. It should make your training better.
The goal stays concrete: train better, develop performance and bring more of that performance to race day.
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