The ten beat range in the suggested heart rate zone permits you to
train the aerobic and anaerobic system.
When riding in the lower half of the heart rate zone (75%-80%) you are in the
aerobic zone which develops your fat burning system, strengthens the immune system and creates
more energy producing sites in your muscles.
In the upper half (80%-85%) you are training in an anaerobic zone, which challenges your body's
ability to tolerate lactic acid and pace over time. From a mental training standpoint, you begin
to understand how to relax and focus during a challenging workout. You will learn how to turn
adversity into an opportunity.
Fitness Solutions 
