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Aerobic versus Anerobic training 

Aerobic literally means with oxygen while anaerobic means without oxygen.

  • The Aerobic training zone is the training intensity where you are burning fuel with oxygen.
  • The Anaerobic training zone is the training intensity where you are burning fuel without oxygen.

The Anaerobic Threshold is the point at which the aerobic, oxygen-burning system can no longer supply enough energy to meet the demands of the exercise and you begin to produce lactic acid. Once over 85% HR max, you will not last longer than a few minutes unless you decrease the intensity. High caliber endurance athletes can feel the point where they are about to cross their Anaerobic Threshold and can operate for long periods of time just below it.