Last year I started studying an online figure drawing class by Glenn Vilppu.
He explains there are basically two ways of drawing: the academic approach, using long poses of many hours where the model is exactly copied, and drawing from imagination, inventing and constructing the figure out of basic forms.
He teaches how to analyse and construct the figure starting with a gesture drawing.
Here are a few pages from my sketchbook of 1 to 5 minute poses.
The poses are from the New Masters Academy online art school.