The stomach is a muscular sac that is important for absorbing food and preparing food for further digestion.
Anaerobic means â€œwithout oxygenâ€. Anaerobic exercises are those in which the muscles being worked obtain energy from glucose and other cellular compounds and not from the oxygen in the blood. Exercises of this type are high-intensity activities for short periods of time, usually under two minutes. Muscle-building exercises such as weight lifting come under the category of anaerobic exercise.