What is a anaerobic zone? definition

Anaerobic simply means "in the absence of oxygen." ... Anaerobic exercise is used by non-endurance athletes to increase strength, power, and speed and by bodybuilders to build lean muscle mass. You can tell if you are in an anaerobic state if you are between 80 percent and 90 percent of your maximum heart rate (MHR).

Hope it is what you are looking for answer!

 The anaerobic zone can be reached through high-intensity exercises such as running, cycling or speed swimming. ... Steady-state anaerobic exercise, also known as a tempo workout, involves gradually increasing the intensity of exercise until you reach 80 to 90 percent of your MHR.

Explanation: