Here’s a helpful review of (assuming you’re referring to the educational PDF resources from PoseSpace.com , a website offering 3D pose reference tools for artists).
Instead of artist-sculpted corrections, physics-based muscle models (finite element or mass-spring) compute true deformation in sampled poses. Pose space then interpolates these expensive sim results in real time. posespace pdf
The cost of life drawing classes is rising, and finding models for specific poses (like a two-person wrestling hold) is nearly impossible unless you have a studio. A costs roughly the same as a sandwich and a coffee. PoseSpace PDF Here’s a helpful review of (assuming
: Most poses are photographed "in-the-round," providing up to 24–30 angles of a single position, which is essential for sculptors and 3D artists. Freeze the skeleton at that exact joint rotation