The main controls for the Physique modifier include the Physique and Floating Bones rollouts for attaching the mesh to the biped, splines, or bones. Additional 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.
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Select a mesh. >
Modify panel > Modifier List > Physique.
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Select a mesh that has the Physique modifier applied to it. > Modify panel > Floating Bones, Physique, and Physique Level of Detail rollouts