Lactate Threshold Estimator
Your lactate threshold (LT) is the exercise intensity at which lactate accumulates faster than it can be cleared — the single most important predictor of endurance performance. Estimate yours from a field test and generate five personalized heart rate training zones.
Method 1: 30-Minute Time Trial (most accurate)
Run or cycle all-out for 30 min. Your average HR for the final 20 min ≈ your LT heart rate.