Which of the following is NOT a benefit of flexibility training?

The correct choice highlights that decreased range of motion is not a benefit of flexibility training. In fact, flexibility training is specifically designed to increase the range of motion in joints and muscles. By enhancing flexibility, individuals can achieve greater mobility, which can lead to improvements in various physical activities and exercises.

Improved posture, enhanced athletic performance, and reduced injury risk are well-established benefits associated with regular flexibility training. Improved posture results from lengthening tight muscles that may pull the body out of alignment, thereby fostering better overall body mechanics. Enhanced athletic performance directly correlates to an individual’s ability to perform exercises with a full range of motion, which is crucial for many sports and activities. Reducing injury risk relates to flexibility training's role in ensuring that muscles and joints can move freely without restriction, thereby minimizing the likelihood of strains and sprains.

Thus, while flexibility training fosters many positive outcomes, a decreased range of motion would contradict the fundamental goals of such training.