Which of the following is NOT a component of a well-rounded exercise session?

A well-rounded exercise session is typically structured to maximize effectiveness and safety, and it generally includes a warm-up, a main workout, and a cool-down. These components serve specific purposes: the warm-up prepares the body for exercise by increasing blood flow and reducing the risk of injury; the main workout focuses on the specific fitness goals, whether they be cardiovascular, strength, flexibility, or a combination; and the cool-down helps to gradually lower heart rate and facilitate recovery.

Skill training can be a valuable part of an exercise routine, especially for individuals looking to improve specific athletic skills or techniques. However, it is not considered a fundamental component of every exercise session. Therefore, while skill training is beneficial in certain contexts, it does not universally apply to the structure of a well-rounded exercise session like the other components do. Thus, the option identifying skill training as not being a core component aligns with this understanding.