Your Training Zones can be calculated based on your Max. Heart Rate, or the heart rate at the Aerobic/Anaerobic Threshold (AT)or according to power (AT or MP tests) A reliable but simple method to determine your pulse or power threshold is to perform a short time trial of at least 20 to max. 30 minutes. Your average heart rate or power over the net TT time is a good indication of your heart rate at threshold. Alternatively you can enter the zones manually at the bottom of this page, for example when you have established them in a lab test.2PEAK will use the zones you enter when issuing training plans and analyzing subsequent uploaded training logs.