Isometric exercises are?

• A. Exercises that involve movement through a range of motion.
• B. Breath-holding exercises.
• C. Exercises that increase muscle tension without shortening or actively moving the muscle.
• D. Exercises that decrease muscle strength.

Answer: (C)

Isometric exercises involve contracting a muscle without shortening it or moving the joint. The muscle tenses against resistance while the length of the muscle and the joint angle stay the same, so there’s no visible movement. This static contraction builds strength and endurance at a particular joint angle and is useful when movement is limited or when joint integrity must be preserved, such as holding a position or pressing against an immovable object. Examples include planks, wall sits, or squeezing a muscle and holding the contraction.

This differs from moving through a range of motion, where the muscle shortens and lengthens as you perform a dynamic exercise. Breath-holding is not the defining feature of isometric work, and while it can occur during intense effort, it’s not what defines the exercise type. Decreasing muscle strength would not describe isometric work, since isometrics aim to increase or maintain strength.