Which of the following should NOT be part of a warm-up routine?

High-intensity sprints should not be part of a warm-up routine because warm-ups are intended to gradually prepare the body for more intense physical activity. They should increase heart rate, enhance muscle elasticity, and improve joint mobility without placing excessive strain on the body. High-intensity sprints can lead to injury if the body is not adequately warmed up, as they demand immediate exertion and can stress muscles and joints that have not been prepared for such intense effort.

Conversely, dynamic stretching, static stretching, and light cardiovascular activities are beneficial components of a warm-up. Dynamic stretching helps to improve flexibility and range of motion while engaging relevant muscle groups, static stretching can prepare the muscles for movement, though it's often used after a workout, and light cardiovascular activities elevate the heart rate gradually, which is critical in preventing injury and enhancing athletic performance.