Final answer:
Low-intensity exercises such as slow walking may not require a warm-up as they are not physically demanding. High-intensity activities, on the other hand, necessitate a warm-up to prevent muscle injuries and tendinitis by preparing the muscles and cardiovascular system.
Step-by-step explanation:
Exercises that don't benefit from a warm-up are typically those of low intensity or activities that are not physically demanding. While most physical activities benefit from a warm-up to prepare the muscles, tendons, and cardiovascular system, gentle activities such as slow walking or light stretching may not necessitate a traditional warm-up routine. Conversely, exercises that involve high intensity, rapid movements, or heavy loads require a thorough warm-up to increase blood flow to the muscles, elevate the heart rate, and prepare the body for the impending stress to reduce the risk of muscle injuries and tendinitis.