Ecorche n. : A manikin, or image, representing an animal, especially man, with the skin removed so that the muscles are exposed for purposes of study.

Example:
What workout will build these muscles?

Taxonomy
Écorché, free encyclopedia, skin, search, Ligier Richier, sculpted, muscles of the body, Renaissance architect, theorist, painters, muscles and bones, first well, cadaver, drawings, far back, ancient Greece, specifics, the French.

Defination from the web:
Écorché by Leonardo da Vinci. Écorché by Ligier Richier. An écorché is a figure drawn, painted, or sculpted showing the muscles of the ... The term écorché, meaning literally "flayed", came into usage via the French Academies (such as the École des Beaux Arts) in the 19th century. ...