Is it really good to cool down after exercise?

At the end of each exercise session, it is highly recommended that you cool-down for five to ten minutes. This is especially important after high-intensity exercise which contains an anaerobic component (for example, very high-resistance training). Anaerobic exercise results in lactic acid accumulation in the bloodstream and muscles. A cool-down period comprised of light aerobic activity will help remove the lactic acid. Also, subsequent to a cool-down period, the muscle soreness that usually follows heavy exercise (resulting not from lactic acid accumulation as was once believed, but rather from micro trauma at the cellular level) is minimized or eliminated.