Oh man, look at that strut. That swagger. Dem glutes! That is one confident-ass (and confident-assed) muscle mannequin.
I highly suggest that anyone that wants to make stronger drawings of people try this, or any way of building a person in 3D. You don't have to go into crazy detail, but having the proportions directly in your hands DOES translate to how you draw it on paper. Plus having a bitty little clay dude to pose is awesome.