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From USA Track and Field Level 1 Coaching Curriculum
This method of training zone selection comes from the USATF Level 1 coaching curriculum. If it's published anywhere else I'm not aware of it. The starting point for this method is a 3200 meter ( 2 mile ) run at maximum pace.  All workout paces are based on this.
A Note: In the USATF Curriculum book all these zones calculations are for runing paces.  But I'm pretty sure they'll work the same with Heart rates. 


The Workouts

Aerobic Threshold Training
Aerobic Threshhold training is done at a pace of 65% of the 2 mile test pace.  It's continuous running designed to train the aerobic threshold.  AKA Lactate Threshhold 1.
 
Lactate Threshold Training
Lactate Threshhold Training is done at a pace of of 85% - 90% of the 2 mile test pace.  It can be done either with long interals or continuous running.
 
Critical ZoneTraining
Critical Zone is defined as the the performance level where energy demands are met with both aeroibic and anaerobic energy systems.  I.e.  above the Lactate threshhold.  So this is done at 100% or greater then 2 mile test pace.