Anaerobic

The term Anaerobic means without oxygen. Anaerobic exercise is of a high intensity which can only be sustained for short periods. This type of exercise cannot be sustained for long periods as oxygen is not used, and lactic acid build up in the muscles causes a burning sensation.
Anaerobic exercise is used to increase muscle function, be it to improve sprinting speed or increase muscle size and strength.
Anaerobic work should be added to your routine for complete fitness. The most common ways to incorporate anaerobic exercise into your routine is by performing a Strength Training routine 2-3 times per week. Anaerobic exercise can also be mixed with Aerobic exercise by performing High Intensity Interval Training.
Common anaerobic exercises are sprinting, heavy weight lifting, and speed cycling/rowing.