Follow Gene's step-by-step guide, then plug in your numbers to get your personalised training zones.
Your Lactate Threshold (LT) is the highest intensity you can sustain without your blood lactate levels spiralling out of control — it's the dividing line between aerobic and anaerobic effort.
Training at and around this zone is one of the most powerful ways to improve your running performance.
This 30-minute field test gives you a reliable estimate of your LT heart rate so you can set accurate training zones without a lab.