Final answer:
A warm-up helps prevent injury by preparing the body for physical activity, increasing heart rate, and blood flow to muscles. Stretching can also be included in a warm-up routine.
Step-by-step explanation:
What helps prevent injury by warming up the body is a warm-up. Warming up the body adequately before engaging in physical activity is crucial for preventing injuries to bones, ligaments, muscle fibers, and tendons. A warm-up typically consists of exercises that gradually increase the heart rate and blood flow to the muscles, thus preparing them for the upcoming activity and reducing the risk of injury.
While stretching can be a component of a warm-up, it alone does not suffice, as a proper warm-up incorporates gentle movements that elevate body temperature and increase muscle elasticity, making them more ready for vigorous movements.
Activities such as slow jogging or cycling can serve as effective warm-up exercises before running or playing sports like soccer. The process of warming up, combined with subsequent cooling down and stretching post-activity, is a comprehensive approach to injury prevention. The correct option is Warm up.