Like Training programs that are based upon maximum heart rate, Anaerobic threshold (AT)-based training zones are relative to varying levels of intensity, each of which serves different training objectives. Each  of these zones develops essential physiological functions that contribute to good health and improved fitness, especially the possibility of weight loss. So you should never limit your training to a single metabolic zone, although you may exercise predominantly in one zone for a given time in order to reach specific training objectives. Except for rank beginners or people with health related limitations, all levels of intensity … [Read more...]