I've been following the drawings in the Hart book devotedly, trying to add the sense of motion and balance that I need for active, non-stiff-looking figures. All my figure drawing has been mechanical and static and stiff, and I never knew why. Figures must always be in some sort of action pose to make them interesting. Therefore I observe and copy carefully Hart's geometric reductions of humanoid forms. The "spine line" must always curve, and the masses of the body are tilted one way or another. I'll get graceful someday.