A cool-down involves much very less time at the end of an exercise session during which the physical activity of the body is gradually reduced to almost its resting level. A cool-down therefore often involves a period of low-impact aerobic exercise which is gradually lessened, followed by a few gentle stretching workout routines. This has a number of effects. The gentle aerobic activity helps to take out any metabolic waste products which may have accumulated during the exercise session. The benefits of an active recovery are believed to be related to the muscles continuing to obtain more extensive supply of oxygenated blood, which will also assist with removing metabolic waste products. During exercise the blood is being pumped around the body by the action of the heart. However, the blood is assisted in its resume the heart via the venous system and muscular contraction. If an athlete stops training suddenly, the heart continues to beat easily, sending blood around the body, but, since exercise has ceased, the blood is do not assisted in its return to the heart. It is suggested that this is one of the reasons why people sometimes feel faint after exercise. During a cool-down, the heart rate is gradually lowered to its resting level and the venous return may be assisted by the actively contracting muscles, thereby preventing this condition.bryant 116b reviewCarrier 24anb7 reviewbryant 113a reviewCarrier 24abb3 review