1️⃣ What “Threshold” Actually Is Physiologically, threshold (LT2 / Critical Speed) marks the upper limit of sustainable effort  — the point where your body can no longer stabilise lactate and VO₂ drifts upward. Below threshold = steady-state aerobic metabolism . Above threshold = non-steady state  — lactate and fatigue rise continuously until you fail. For HYROX and running, this boundary defines your engine capacity : how hard you can go before the wheels fall off. Think of

Optimising VO₂max and Lactate Testing for Better Running and HYROX Performance Intervals are one of the most effective tools in endurance...

How Hybrid and Hyrox Athletes Can Maximise Mitochondrial Adaptation and Critical Power Why can some athletes sustain high-intensity work...