'isometrics' definitions:

Definition of 'isometrics'

(from WordNet)
noun
Muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change) [syn: isometrics, isometric exercise]

Definition of 'isometrics'

From: GCIDE
  • isometric exercise \i`so*met"ric ex"er*cise\, n. A system of exercise to strengthen specific muscles of the body by pushing parts of the body (such as the two hands) strongly against each other, or against a fixed object, so that the muscles are strongly stressed, but are stretched only a little. It is claimed to produce strength in the muscles thus exercised. Also called isometrics. [PJC]

Definition of 'isometrics'

From: GCIDE