isometrics definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun (used with a sing. or pl. verb)
Exercise or a system of exercises in which isometric muscular contraction is used to strengthen and tone muscles, performed by the exertion of effort against resistance, usually of a stationary object.
isometrics - Medical Definition