|Michael Whynot. Male torso study in motion, 2013. Red chalk.|
Drawing the human form in motion can be challenging. The figure above was drawn in fifteen minutes from imagination. A convincing rendering needs to take many things into consideration: gesture, point of view, light source, anatomy. These can all be set up in the studio with a model and props to help them maintain the pose, but it is expensive, both in terms of time and money. For initial studies, drawing from imagination can be the best option. Anatomy, light and shadow can be refined with the aid of a model after you actually have something.
I believe that creativity can wither with disuse. Too much copying of nature can be as detrimental as not enough. The artist must balance the two. Use your imagination daily; allow creativity to grow.