Which statement best describes isometric exercise?

• A. Use muscle tension to improve strength with little movement.
• B. Exert resistance against the muscle as it moves through a range of motion.
• C. Involve joint movement with contractions.
• D. Aerobic rhythmic activity over extended periods.

Answer: (A)

Isometric exercise builds strength by generating muscle force without moving the joint. In isometric work, you contract the muscle and hold against resistance, but the joint stays essentially in the same position. Think of a plank, wall sit, or pressing hands together and holding—the muscle is under tension, but there’s little to no movement. That’s why this description fits best: it emphasizes using muscle tension to improve strength with minimal movement.

The other ideas describe dynamic forms of training. Moving through a range of motion with resistance is a dynamic (isotonic) contraction, where the muscle shortens and lengthens as you move. Any activity that involves joint movement with contractions falls into that category, and aerobic rhythmic activity focuses on sustained movement over time rather than static contractions.