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There are two types of muscle reading. "Contact" muscle reading in which the magician stays in contact with the spectator by grasping his wrist or holding on object like a handkerchief between them. “Noncontact” muscle reading consists of having the spectator follow the performer about and having to "read" his hesitation patterns.
The art is also referred to as Hellströmism after Alex Hellström who made it popular early in the twentieth century. It has also been called Cumberlandism, after the English performer Stuart Cumberland.