Official U.S. Army Fitness Training Handbook: U.S. Army

A soldier's level of physical fitness has a direct impact on his combat readiness. The many battles in which American troops have fought underscore the important role physical fitness plays on the battlefield. The renewed nationwide interest in fitness has been accompanied by many research programs. The overwhelming conclusion is that such programs enhance a person's quality of life, improve productivity, and bring about positive physical and mental changes. Not only are physically fit soldiers essential to the Army, they are also more likely to lead enjoyable, productive lives.
This manual covers issues relating directly to the development and maintenance of the five components of physical fitness: cardiorespiratory endurance, muscular strength, muscular endurance, flexibility, body composition.
U.S. Army Fitness Training Handbook is an outstanding resource for anyone interested in improving physical health, mental health, and general well-being.