Free radicals are formed during a chain reaction usually when oxygen reacts with certain substances in the body.
Free radicals produce more free radicals, which destroy body cells and tissues.
It is now believed that many diseases such as Parkinson's disease, certain types of cardiovascular disease, and some cancers are either directly or indirectly caused by free radical formation. Also, studies show that strenuous exercise can increase the amount of free radicals in the body resulting in fatigue and many of the effects associated with over training. Since boxers must constantly train at a heavy intensity, they may be more susceptible to free radical damage. Fortunately, it appears that the body improves its natural defense against free radicals as it adapts to heavy exercise. Therefore, well-trained athletes tend to become more resistant to free radicals.