Which of the following is NOT a type of stretch?

The correct answer is isometric because it refers to a type of muscle contraction rather than a stretching technique. In isometric exercises, muscles generate force without changing length, meaning the muscle remains in a fixed position under tension. This is different from stretching, which involves lengthening muscles to improve flexibility and range of motion.

Static, ballistic, and dynamic stretching are all recognized methods of stretching. Static stretching involves holding a stretch for a period to elongate the muscle. Ballistic stretching incorporates bouncing movements to push the body beyond its normal range of motion, and dynamic stretching involves controlled movements that prepare the muscles and joints for activity by actively moving parts of your body through their full range of motion. Understanding the differences between these techniques is essential for developing effective stretching programs for runners.