title: Spontaneous injury caused by a muscle exerciser.
abstract: Two patients with spontaneous injuries occurring while using a 'Bullworker' exerciser are described. An explanation for their injuries is suggested.
mesh_terms: D000328:Adult; D006801:Humans; D006810:Humeral Fractures / Q000209:etiology*; D007537:Isometric Contraction; D008297:Male; D009119:Muscle Contraction; D013119:Spinal Cord Injuries / Q000209:etiology*