https://www.wattsatelier.com/project/figure-phase-iii-quicksketch-fundamentals/

Welcome to Quicksketch Fundamentals! This class will cover the basics that must be understood for the successful execution of figure quicksketch drawing.  This course will approach figure quicksketch by breaking down the discipline into three understandable principles: Gesture, Structure, and Mass.  By studying these three principles separately, students can then work to integrate them as a whole, and work their way towards mastering the art of quicksketch.