For the same reason, track cyclists usually begin their warm-up with some sort of unrelated exercise. Whatever warm-up you choose, it should be intense enough to increase body temperature but not so intense as to make you tired. Research has shown that an adequate warm-up prevents muscle strains, tears, and soreness that would probably occur if the athlete went into full performance without it. A cool-down helps your circulatory and metabolic systems return gradually to resting levels. There are several benefits of a cool-down.
Lactic acid dissipates.
Mild exercise speeds up the removal of lactic acid from the blood and muscles, which is thought to aid recovery. Blood flow returns to normal. During exercise, the blood vessels that bring oxygen and nutrients to your working muscles are wide open. A cool-down helps the blood return to the heart and allows blood vessels to return to normal size. Blood doesn't pool.