Today, most exercises and sports, even those in the Olympic Games, are focused mainly on developing muscular strength and cardiovascular stamina. However, the human body is not just composed of the muscular and cardiovascular systems. It also includes the immune, endocrine, and lymphatic systems, among others. However, these systems are not addressed by most approaches to exercise and fitness. As a result, the current fitness industry appears to fall far short of serving the true health needs of people today.
Furthermore, although regular exercise is thought to be highly effective for the prevention and treatment of many common chronic diseases, and improves cardiovascular health there is increasing evidence suggesting that excessive exercise can have a negative impact on the body and on longevity. Studies have shown that acute, high-intensity exercise causes short-term damage to the cell’s mitochondria and short term muscle damage in the body (Clinical Journal of Sports Medicine, 1998)*
Additionally, according to a review of the literature published in the Mayo Clinic Proceedings**, long-term excessive endurance exercise may induce pathologic structural remodeling of the heart and large arteries. Emerging data suggest that chronic training for and competing in extreme endurance events such as marathons, ultra-marathons, ironman distance triathlons, and very long distance bicycle races, may cause structural changes to the heart and large arteries, leading to myocardial injury.