Aerobic/Anaerobic Metabolism... metabolism with oxygen is aerobic; metabolism without oxygen is anaerobic.

In the aerobic production of energy, oxygen is used or combusted along with fats and carbohydrates to produce energy (ATP). The waste products are water and carbon dioxide.

In the anaerobic production of energy, oxygen is not used and carbohydrates are only partially combusted producing lactic acid (lactate) as the end product.

Aerobic and anaerobic metabolism occur during almost all types of exercise. The purpose of adding Body'Fit pH Fitness to a workout routine is to generate an increased metabolic rate 'aerobically', providing 16 times more energy than anaerobic exercise.