Definition of "isometrics" [i•so•met•rics]

• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Although situps can be an effective stomach exercise, I firmly believe that doing stomach isometrics is much more effective."
• "He was always trying new techniques, and he’d discovered something called isometrics, which meant, he said, working out against immovable objects."
• "He likes to include weightlifting, isometrics and core body strengthening exercises."