Which statement best describes a warm-up in the context of exercise?

• A. Warm-up decreases heart rate.
• B. Warm-up has no effect on heart rate.
• C. Warm-up increases heart rate.
• D. Warm-up stops heart rate from changing.

Answer: (C)

A warm-up prepares the body for activity by gradually increasing effort, which makes the heart beat faster. As you start moving, your heart pumps more blood to your muscles to supply oxygen and nutrients, and your body temperature rises. This warming up also improves joint lubrication and nerve signaling, helping movements feel smoother and reducing the chance of injury. Because of these effects, heart rate rises during a warm-up. The other ideas—heart rate decreasing, staying the same, or stopping change—don’t reflect how the body responds to starting activity. So the best description is that a warm-up increases heart rate. For practical context, a short, light activity like brisk walking or dynamic stretches for about 5–10 minutes works well to elevate heart rate safely.