Select a mesh. > Modify panel > Modifier List > Physique.
Select a mesh that has the Physique modifier applied to it. > Modify panel > Floating Bones, Physique, and Physique Level
of Detail rollouts
Physique is a modifier. Controls for Physique appear on the Modify panel. The Physique and Floating Bones rollouts are for attaching the mesh to the biped, splines, or bones. Controls in the Physique Level Of Detail rollout are for troubleshooting envelopes, bulges, and tendons. The sub-object controls are for fine-tuning envelopes, creating and adjusting tendons and bulges, and for vertex editing.