If you think that you cool down after you exercise to prevent muscle soreness, you are wrong. You cool down to prevent dizziness.
When you exercise, your muscles serve as a second heart pumping blood through your body. When your muscles relax, the veins near them fill up with blood. When the muscles contract, they squeeze the veins near them and pump blood toward the heart. If you are exercising vigorously and stop suddenly, your muscle stop pumping blood, then your heart has to pick up the extra work immediately. It may not be able to do that, so it could start to beat irregularly, or it may not be able to pump enough blood to your brain, causing you to feel dizzy, or even pass out. So, after exercising vigorously, slow down gradually to protect your heart and keep you from feeling dizzy.
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