MUSCLES AND TOXINS
During exercise, the muscles produce natural waste that must be eliminated. This waste, called lactates, makes up part of the glucose processing chain in the muscles (glycolysis). Lactates, also called lactic acid, occur at the end of this chain, which is why they are considered waste products, but they are then used by many organs to produce energy.
Therefore, contrary to popular belief, it isn't lactic acid that causes the aches and pains you feel after exercise. It is in fact muscle acidosis, a waste product secreted at the same time as lactates. Stretching your muscles allows you to remove this waste. It does this by improving blood flow in the muscles, aiding the removal of any toxins.
In short, the body naturally removes the waste it produces. However, we can do a few small things to help it cleanse itself.