training more efficiently. Canadian Olympian Kim St-Pierre uses eccentric training as part of her regime. The Esmonde Technique takes eccentric training and makes it available to the masses through Classical Stretch and Essentrics. After having hip surgery in the summer of 2007, St-Pierre began to practice the Esmonde Technique with experts Miranda Esmonde-White from PBS’s Classical Stretch and Sahra Esmonde-White host of the Essentrics workout in order to heal her hip. According to tests, increases in both strength and muscle fiber are higher in eccentric training than in traditional concentric training. The rehabilitative nature, low energy costs, high magnitudes of force, and low uptake of oxygen all align eccentric exercise for both the elderly and rehabilitative functions. In old age, loss of strength and muscle mass is commonplace. Add to these factors disease and cardiac and respiratory illness. Eccentric training enables the elderly, and those with the same problems, the ability to train muscle groups and increase strength and resiliency with low-energy exercise. Eccentric training has been found to be beneficial to those with a variety of physical ailments. According to one systematic review and meta-analysis on shoulder impingement syndrome, eccentric training didn't improve pain or function more than other types of training. Anterior cruciate ligament damage Tearing an anterior cruciate ligament (ACL) in the knee causes serious damage that can last several years and often requires surgery. The ACL is one of the four main stabilizing ligaments of the knee. During the post-operative rehabilitation of patients, eccentric training can be used as a cornerstone of developing muscle size and strength. According to tests conducted by J. Parry Gerber in 2007, structural changes in the muscles greatly exceeded those achieved with standard concentric rehabilitation. The success of the involvement of gradual progressive exposure to negative work ultimately led to the production of high muscle force. Sarcopenia Sarcopenia is the progressive loss of muscle mass due to aging. Muscle mass begins to deteriorate as early as the age of 25, and consistently deteriorates into old age. By the age of 80 "one half of the skeletal muscle has been lost" (Lastayo, Woolf, Lewek, Snyder-Mackler, Reich & Lindstedt, 2003). With this great decrease in mass, strength is also decreased. Eccentric training has the ability to counteract sarcopenia through sustained training. The unique trait of greater overloads to the muscle with less strenuous impact on the body, as well as cardiac and respiratory