Estimate your Lactate Threshold Heart Rate (LTHR) and pace using performance data from a time trial. Based on the widely-used method by Joe Friel, this tool requires you to perform a 30-minute all-out time trial. By inputting your average heart rate and pace from the final 20 minutes of that trial, you can get a reliable estimate of your lactate threshold, which is crucial for setting accurate training zones and improving endurance performance.