What doe anaerobic mean?

Answer 1

Respiration without oxygen. Anaerobic Exercise There are three energy-producing systems in the human body, one of which is aerobic (using oxygen), and two of which are anaerobic (not using oxygen): ATP-CP and Glycolysis.

ATP-CP

For the first few seconds you exercise you're using the ATP-CP system. This relies on stored ATP (adenosine triphosphate, the molecule that produces the energy in all living things, from bacteria on up).

Another stored molecule, CP (creatinine phosphate) helps restore your ATP. CP is restored aerobically (with oxygen).

Glycolysis

When you exercise beyond the limit of your ATP-CP stores (anything more than a few seconds) the second anaerobic system kicks in: anaerobic glycolysis.

This makes ATP from glucose (sugar) stored in your liver and muscles. You get the glucose from eating carbohydrates. (Eating a reasonable amount of carbs after exercising helps increase the glucose stores.)

When you exercise beyond the limits of your ATP-CP and glucose systems, your body needs to start producing energy "on the fly" [without O2] using lactic acid instead. That is anaerobic Respiration - without O2.

Answer 2

Without oxygen