The word physical fitness originated in America. Broadly speaking, it refers to the adaptability of human body to the external environment.
The contents of physical fitness research mainly include: the connotation of physical fitness, the significance of physical fitness training, the influence of the development and working characteristics of different sports systems such as nerves, bones and muscles on sports quality, the relationship between physical fitness and skills, war energy, heart energy and knowledge energy, the training methods of speed, strength and endurance, the training arrangement of physical fitness, the monitoring means and evaluation of physical fitness training, and the recovery of physical fitness after fatigue under the influence of load.
Physical fitness is the comprehensive ability of human body to adapt to the environment. Physical fitness includes healthy physical fitness and competitive physical fitness.
The goal of healthy physical fitness is to improve health and basic activity ability, and the goal of competitive physical fitness is to pursue the physical fitness needed to create excellent sports results in competitive competitions. The highest state of physical fitness is the body's adaptation to competitive sports, and sports training is the development of the body's ultimate ability. In order to create excellent sports results, it is necessary to comprehensively train all kinds of physical adaptability that affect sports results and adjust them to the best state.
Physical fitness discussed in the field of competitive sports, especially sports physical fitness, is usually called physical fitness in the field of sports training. Physical fitness is the general name of all kinds of physical abilities necessary for athletes to improve their sports skills and create excellent sports results. It is the comprehensive ability of athletes' bodies to adapt to external stimuli or external environment, which is related to people's sports ability, adaptability and psychological factors (mainly willpower).