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Michael Hampton's Gesture Course
Michael Hampton is one of my favourite figure drawing teachers, specifically because of how he approaches things from a basis of structure, which as you have probably noted from Drawabox, is a big priority for me. Gesture however is the opposite of structure however - they both exist at opposite ends of a spectrum, where structure promotes solidity and structure (and can on its own result in stiffness and rigidity), gesture focuses on motion and fluidity, which can result in things that are ephemeral, not quite feeling solid and stable.
With structure and spatial reasoning in his very bones, he still provides an excellent exploration of gesture, but in a visual language in something that we here appreciate greatly, and that's not something you can find everywhere.