Most platforms take a number you estimated and cut it into fifths. Here the two thresholds are measured, and everything downstream is anchored to them.
Five zones generated from the thresholds you just measured, each with its power or pace band and the heart rate that went with it on test day. Ready to paste into whatever the athlete trains with.
LT1 is where lactate first lifts off baseline; LT2 is the highest intensity you can hold at a steady lactate. Load, categories, time in zone and the retest nudge are all computed from those two.
Time in zone is minutes below LT1, at LT1, between, at LT2 and above — the same definition for every athlete, so a coach comparing two people is comparing the same thing.
When weeks of sessions agree that a threshold has shifted, the app says so, says how confident it is, and says why. Zones stop describing you long before you notice on your own.
Connect a device, enter a test, and see your own numbers in it. Cancel whenever.
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