Warm ups and cool downs can ultimately 1. Increase you risk of injury
2. Decrease your risk of injury
3. Help you get in your target heart rate zone
4. Improve all skill components

Number 2 is correct

Explanation:

Warming up helps you to gradually increase your heart rate and breathing to a level that will be able to meet the demands of your workout. If you start exercising at a strenuous level without warming up first, you will place unnecessary stress on your heart and lungs.

If you stop exercising abruptly without cooling down, your muscles will suddenly stop contracting vigorously. This can cause blood to pool in the lower extremities of your body, leaving your blood without as much pressure to be pumped back to the heart and brain.