The type of stretching characterized as static and held for a set period of time is known as passive stretching. In this technique, an individual uses external assistance—such as a partner, a prop, or gravity—to maintain a stretch in a given position without actively engaging the muscles involved. This method allows for deeper elongation of muscles and increased flexibility, making it an effective practice for improving range of motion.
In passive stretching, the focus is on relaxing the muscles while allowing them to be gently pulled into a stretch. This approach contrasts with active stretching, where a person actively engages their muscles to achieve the stretch, and with ballistic stretching, which involves bouncing movements and can increase the risk of injury due to its dynamic nature. Dynamic stretching involves active movements that progressively increase reach, speed of movement, or both, often used as part of a warm-up routine rather than sustained holds.
Thus, passive stretching is vital for enhancing flexibility through its static and prolonged holds, making it the correct answer in this context.