Why study the nude body? Because the human body is the most complex and challenging subject in nature, which allows an artist to learn about a variety of techniques, simply by observing and interpreting this most complex of forms.
The primary purpose of gesture drawing is to facilitate the study of the human figure in motion. This exploration of action is helpful for the artist to better understand the exertions of muscles, the effects of twisting on the body, and the natural range of motion in the joints. Basically, it is a method of training hands to sketch what the brain has already seen. A gesture drawing is a laying in of the action, form, and pose of a model/figure. Typical situations involve an artist drawing a series of poses taken by a model in a short amount of time, often as little as 10 seconds, or as long as 5 minutes.