Understanding your lactate threshold can transform your running performance. It’s a key factor that separates casual joggers from competitive runners. This post explains what happens in your body at the lactate threshold, how you can measure it, the difference between LT1 and LT2, and how to train effectively to improve your thresholds, running pace and endurance. Runner's legs in motion on a forest trail during sunrise What Is Lactate Threshold in Running? Lactate threshold