What does isometric mean?

• A. Use muscle tension to improve strength with little or no movement.
• B. Exert resistance against the muscle as it moves through a range of motion.
• C. Combine movement of the joints with contractions.
• D. Rhythmic activities over a long time.

Answer: (A)

Isometric exercise involves contracting a muscle without changing its length or moving the joint. This builds strength by generating tension while the body stays in a fixed position. That’s why the option describing using muscle tension to improve strength with little or no movement is the best match. For contrast, actions where you resist a force as the joint moves through a range of motion involve movement and changing muscle length (dynamic contractions). Combining joint movement with contractions is also a dynamic pattern, not a static hold. Rhythmic, long-duration activity targets endurance or cardio fitness rather than static strength work. Planks, wall sits, and similar holds are classic examples of isometric efforts.