Final answer:
Warm-up exercises should be low-intensity and increase heart rate, breathing, and temperature. They should not last 20 to 30 minutes.
Step-by-step explanation:
Warm-up exercises are an essential part of a workout routine as they help prepare the body for more intense physical activity. It is important for warm-up exercises to be low-intensity in order to gradually increase the heart rate, breathing, and body temperature. However, warm-up exercises should not last for 20 to 30 minutes as stated in option C. The optimal duration for warm-up exercises is typically around 5 to 10 minutes.
Learn more about Warm-up exercises in physical activity